{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-sedan-avant-2016","title":"Milltek Sport Cat-Back Exhaust - 2016+ Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026 Avant","description":"\u003cp\u003eUpgrade the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (2016+) with a Milltek Sport cat-back exhaust. Milltek builds each system around the car it fits: mandrel-bent T304L stainless pipework, a larger bore than stock for freer flow, and a tuned sound you choose, from quiet and refined to loud and uncorked.\u003c\/p\u003e\u003ch3\u003eSound options\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eResonated\u003c\/strong\u003e options keep cruising drone down and sound closer to a refined sports car.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-resonated (louder \/ race)\u003c\/strong\u003e options give the loudest, rawest note. Better for track days and weekend cars than daily commuting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eChoose your setup\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound:\u003c\/strong\u003e the system type and sound level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Finish:\u003c\/strong\u003e the tailpipe trim.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Downpipe:\u003c\/strong\u003e add a Milltek catted or catless downpipe built to fit this cat-back. Pick Cat-Back Only to skip it.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCat-back systems: compare every part number\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eSound\u003c\/th\u003e\n\u003cth\u003eTip finish\u003c\/th\u003e\n\u003cth\u003ePipe size\u003c\/th\u003e\n\u003cth\u003eFit time\u003c\/th\u003e\n\u003cth\u003eRace\/Track only\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU651\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU650\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU655\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU659\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad Oval\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU658\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU652\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eTitanium Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU656\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad Oval\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU657\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eTitanium Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU653\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eBurnt Titanium Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU654\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eBurnt Titanium Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU724\u003c\/td\u003e\n\u003ctd\u003eNon-Resonated (Louder)\u003c\/td\u003e\n\u003ctd\u003eQuad JET-100 Carbon\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU641\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU640\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU644\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU648\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003ePolished Quad Oval\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU645\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU642\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eTitanium Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU649\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eCerakote Black Quad Oval\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU646\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eTitanium Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU643\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eBurnt Titanium Quad GT-100\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU647\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eBurnt Titanium Quad GT-90\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU723\u003c\/td\u003e\n\u003ctd\u003eResonated (Quieter)\u003c\/td\u003e\n\u003ctd\u003eQuad JET-100 Carbon\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003ctd\u003e1.00 to 1.50 hours\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhat comes with each cat-back\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU651\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU650\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU655\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU659\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU658\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU652\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU656\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU657\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU653\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU654\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x 90mm Burnt Titanium Trims; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU724\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Carbon Jet-100 Trims (To Fit 63.5mm OD Outlets); 102 Jet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU641\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU640\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU644\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU648\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU645\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU642\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU649\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU646\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tip Assembly; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU643\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU647\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x 90mm Burnt Titanium Trims; Quad 90mm GT90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU723\u003c\/strong\u003e: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD \u0026amp; RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Carbon Jet-100 Trims (To Fit 63.5mm OD Outlets); 102 Jet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDownpipe options: compare every part number\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eOption\u003c\/th\u003e\n\u003cth\u003eFits with (Milltek)\u003c\/th\u003e\n\u003cth\u003eStage 2 ECU remap\u003c\/th\u003e\n\u003cth\u003eRace\/Track only\u003c\/th\u003e\n\u003cth\u003ePipe size\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU674\u003c\/td\u003e\n\u003ctd\u003eCat Replacement Pipe: Cat Bypass, fits with OE and Milltek Sport Cat back Systems\u003c\/td\u003e\n\u003ctd\u003eCat Bypass, fits with OE and Milltek Sport Cat back Systems\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU673\u003c\/td\u003e\n\u003ctd\u003eCatted Downpipe (Race\/Track only): 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems\u003c\/td\u003e\n\u003ctd\u003e200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSSXAU725\u003c\/td\u003e\n\u003ctd\u003eCatted Downpipe (EC-approved): Fits with OE and Milltek Sport Cat back Systems\u003c\/td\u003e\n\u003ctd\u003eFits with OE and Milltek Sport Cat back Systems (EC Approved) EC-Approved\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e2.50\" (63.50mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\"Race\/Track only\" and \"Stage 2 ECU remap\" are shown only where Milltek states them. A dash means Milltek does not state it for that part.\u003c\/p\u003e\u003ch3\u003eWhat comes with each downpipe option\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU674\u003c\/strong\u003e: 1 x Cat Bypass Assmbly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU673\u003c\/strong\u003e: 1 x High Flow Cat Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSXAU725\u003c\/strong\u003e: 1 x HJS ECE Downpipe Euro 6 200CPSI\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCatted and catless downpipes\u003c\/h3\u003e\u003cp\u003eA \u003cstrong\u003ecatted downpipe\u003c\/strong\u003e keeps a catalytic converter in the downpipe. A \u003cstrong\u003ecatless downpipe\u003c\/strong\u003e (de-cat) replaces it with a straight pipe. Each option name above says which one it is.\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant, 2016+. US-market model listing. Confirm your exact model, engine and options before ordering, and message us if you are not sure.\u003c\/p\u003e\u003ch3\u003eAbout Milltek Sport\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eT304L stainless steel, CNC mandrel bent.\u003c\/li\u003e\n\u003cli\u003eDesigned and developed in Derby, UK with a US facility in Knoxville, Tennessee, and tested at the Nürburgring.\u003c\/li\u003e\n\u003cli\u003eCompany founded in 1983.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty\u003c\/h3\u003e\u003cp\u003eMilltek covers most products with a lifetime guarantee. Downpipes, hi-flow catalysts and any part with valves are covered for 2 years or 80,000 km, and electronic products for 2 years. Claims go through the authorized dealer you bought from, and cover the original purchaser only. Full terms: millteksport.com\/Warranty.html\u003c\/p\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCatless downpipes and other cat bypass parts replace emissions equipment. They are sold for off-road and competition use where local law allows. You are responsible for checking the rules that apply to your vehicle.\u003c\/li\u003e\n\u003cli\u003eFitting times are Milltek estimates for a professional installer.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek Sport","offers":[{"title":"Non-Resonated (Louder) \/ Cerakote Black Quad GT-100 \/ Cat-Back Only","offer_id":67999411470487,"sku":"SSXAU651","price":3278.0,"currency_code":"USD","in_stock":true},{"title":"Non-Resonated (Louder) \/ Cerakote Black Quad GT-100 \/ Cat Replacement Pipe: Cat Bypass, fits with OE and Milltek Sport Cat back Systems","offer_id":67999411503255,"sku":"SSXAU651 + SSXAU674","price":4163.0,"currency_code":"USD","in_stock":true},{"title":"Non-Resonated (Louder) \/ Cerakote Black Quad GT-100 \/ Catted Downpipe (Race\/Track only): 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems","offer_id":67999411536023,"sku":"SSXAU651 + SSXAU673","price":6432.0,"currency_code":"USD","in_stock":true},{"title":"Non-Resonated (Louder) \/ 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