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Upgrade the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (2021+) with a Milltek...
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Upgrade the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (2021+) 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.
Choose your setup
- Sound: the system type and sound level.
- Tip Finish: the tailpipe trim.
- Optional Downpipe: add a Milltek catted or catless downpipe built to fit this cat-back. Pick Cat-Back Only to skip it.
Cat-back systems: compare every part number
| Part # | Sound | Tip finish | Pipe size | Fit time | Race/Track only |
|---|---|---|---|---|---|
| SSXBM1169 | Axle Back System - Requires OE system to be cut | Polished GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1170 | Axle Back System - Requires OE system to be cut | Cerakote Black GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1171 | Axle Back System - Requires OE system to be cut | Brushed Titanium GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1172 | Axle Back System - Requires OE system to be cut | Burnt Titanium GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1173 | Axle Back System with JET-115 Carbon Trims - Requires OE system to be cut | Standard (OE Tips) | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1317 | Secondary Cat Back System with Centre Resonator Bypass & - Requires OE system to be cut | Polished GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1318 | Secondary Cat Back System with Centre Resonator Bypass & - Requires OE system to be cut | Cerakote Black GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1319 | Secondary Cat Back System with Centre Resonator Bypass & - Requires OE system to be cut | Brushed Titanium GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | Yes |
| SSXBM1321 | Secondary Cat Back System with Centre Resonator Bypass & - Requires OE system to be cut | Carbon Fiber JET-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
| SSXBM1320 | Secondary Cat Back System with Centre Resonator Bypass & - Requires OE system to be cut | Burnt/Blue Titanium GT-115 | 3.15" (80.00mm) | 1.50 to 2.00 hours | - |
What comes with each cat-back
- SSXBM1169: 2 x Adapters to OE GPF/OPF; 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Rear Silencer; 4 x Polished 4.5" Trims; 115 GT Milltek note: Axle Back System with GT-115 Polished Trims - Requires OE system to be cut.
- SSXBM1170: 2 x Adapters to OE GPF/OPF; 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Rear Silencer; 4 x Cerakote Black 4.5" Trims; 115 GT Milltek note: Axle Back System with GT-115 Cerakote Black Trims - Requires OE system to be cut.
- SSXBM1171: 2 x Adapters to OE GPF/OPF; 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Rear Silencer; 4 x Titanium 4.5" Trims; 115 GT Milltek note: Axle Back System with GT-115 Brushed Titanium Trims - Requires OE system to be cut.
- SSXBM1172: 2 x Adapters to OE GPF/OPF; 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Rear Silencer; 4 x Burnt Titanium 4.5" Trims; 115 GT Milltek note: Axle Back System with GT-115 Burnt Titanium Trims - Requires OE system to be cut.
- SSXBM1173: 2 x Adapters to OE GPF/OPF; 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Rear Silencer; 4 x Carbon Fibre 4.5" Trims; 115 JET Milltek note: Axle Back System with JET-115 Carbon Trims - Requires OE system to be cut.
- SSXBM1317: 1 x LH Silencer Bypass (to OE GPF); 1 x RH Silencer Bypass (to OE GPF); 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Chassis Brace Plate; 1 x Rear Silencer; 4 x Polished 4.5" Trims; 115 GT Milltek note: Secondary Cat Back System with Centre Resonator Bypass & GT-115 Polished Trims - Requires OE system to be cut.
- SSXBM1318: 1 x LH Silencer Bypass (to OE GPF); 1 x RH Silencer Bypass (to OE GPF); 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Chassis Brace Plate; 1 x Rear Silencer; 4 x Cerakote Black 4.5" Trims; 115 GT Milltek note: Secondary Cat Back System with Centre Resonator Bypass & GT-115 Cerakote Black Trims - Requires OE system to be cut.
- SSXBM1319: 1 x LH Silencer Bypass (to OE GPF); 1 x RH Silencer Bypass (to OE GPF); 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Chassis Brace Plate; 1 x Rear Silencer; 4 x Titanium 4.5" Trims; 115 GT Milltek note: Secondary Cat Back System with Centre Resonator Bypass & GT-115 Brushed Titanium Trims - Requires OE system to be cut.
- SSXBM1321: 1 x LH Silencer Bypass (to OE GPF); 1 x RH Silencer Bypass (to OE GPF); 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Chassis Brace Plate; 1 x Rear Silencer; 4 x Carbon Fibre 4.5" Trims; 115 JET Milltek note: Secondary Cat Back System with Centre Resonator Bypass & JET-115 Carbon Fiber Trims - Requires OE system to be cut.
- SSXBM1320: 1 x LH Silencer Bypass (to OE GPF); 1 x RH Silencer Bypass (to OE GPF); 1 x LH Valved Link & Outlet Pipe; 1 x RH Valved Link & Outlet Pipe; 1 x Chassis Brace Plate; 1 x Rear Silencer; 4 x Burnt Titanium 4.5" Trims; 115 GT Milltek note: Secondary Cat Back System with Centre Resonator Bypass & GT-115 Burnt/Blue Titanium Trims - Requires OE system to be cut.
Downpipe options: compare every part number
| Part # | Option | Fits with (Milltek) | Stage 2 ECU remap | Race/Track only | Pipe size |
|---|---|---|---|---|---|
| SSXBM1271 | Catless Downpipe (Race/Track only): needs Stage 2 ECU remap - Fits to OE and Milltek Sport Systems | Requires Stage 2 ECU Remap - Fits to OE and Milltek Sport 3" Midpipe Systems | Required | Yes | 3.00" (76.20mm) |
| SSXBM1235 | Catted Downpipe (Race/Track only): with HJS HQ 200CPSI Cats (No CEL or ECU Software Required) - Fits to OE Secondary Cats & Milltek... | with HJS HQ 200CPSI Cats (No CEL or ECU Software Required) - Fits to OE Secondary Cats & Milltek Sport 3" Cat Back System | - | Yes | 3.00" (76.20mm) |
"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.
What comes with each downpipe option
- SSXBM1271: 1 x LH Primary Cat Bypass; 1 x RH Primary Cat Bypass; 1 x LH Cat Link Pipe Milltek note: Requires Stage 2 ECU Remap - Fits to OE and Milltek Sport Systems.
- SSXBM1235: 1 x LH Downpipe & Cat Assembly; 1 x RH Downpipe & Cat Assembly; 1 x LH Cat Link Pipe Milltek note: with HJS HQ 200CPSI Cats (No CEL or ECU Software Required) - Fits to OE Secondary Cats & Milltek Sport Cat Back System.
Catted and catless downpipes
A catted downpipe keeps a catalytic converter in the downpipe. A catless downpipe (de-cat) replaces it with a straight pipe. Each option name above says which one it is.
Fitment
BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo, 2021+. US-market model listing. Confirm your exact model, engine and options before ordering, and message us if you are not sure.
About Milltek Sport
- T304L stainless steel, CNC mandrel bent.
- Designed and developed in Derby, UK with a US facility in Knoxville, Tennessee, and tested at the Nürburgring.
- Company founded in 1983.
Warranty
Milltek 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
Notes
- Catless 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.
- Some downpipe options need a Stage 2 ECU remap. Read the option name before you order.
- Fitting times are Milltek estimates for a professional installer.
If you have any fitment questions, please feel free to reach out to our team via the contact methods below. If you are contacting us for any order status updates, please give us a call, or email us. We are a lean operation bringing you the best shopping experience possible. We are working on your orders as quickly as we can. We thank you for your patience.
- Call:
- Please reach out to us at (310) 231-0292 for sales inquiries if you are in the United States, Canada, Mexico.
- Email:
- For more in-depth product questions, fitment questions, product inquiries please email our performance specialists at online@autotalent.com.
- All other inquiries:
- Please direct your inquiries to the chat functionality on our website.
Returns Policy
If a product is ordered and not wanted, the UNUSED item can be returned for a 25% restocking fee unless otherwise specified. In some cases, we may offer the ability to return the item to us for a lesser restocking fee and then keep the balance as a store credit. To return an item, it must be in brand new condition with original packaging.
We cannot accept a return on special ordered or custom items.
Shipping is non refundable in either direction unless approved by AutoTalent. All items wanting to be return MUST be reported within 30 days of the original invoice date. No items will be returnable after 30 days. All products shipped from the AutoTalent facility are shipped via FedEx, USPS, or USPS. Some packages shipped from the manufacturer may or may not require signatures for package release.
Special Order Items
Some items may be special order specifically for the customer’s vehicle. These items generally require a deposit or paid in full. Once this deposit amount is notified to the customer and they agree to order the special order item, the deposit becomes non-refundable. These special order items cannot be returned or resold. Cancellations are not allowed on special order parts.
AutoTalent DOES NOT REFUND SHIPPING CHARGES. If you modify, install, or alter the item in any form, we cannot accept it as a return. We will not cover any expenses related to the product or installation, and you may be required to purchase a replacement.
** All cancellations that are requested that are NOT due to items not being in stock or delayed by the manufacturer are subject to a 5% processing fee. When you place an order with us we pay credit card fees that are NOT returned back to us. We will absorb these fees if we do not have the item in stock OR if you agree to the original ETA and that ETA is NOT met. If you decide to cancel for any other reason you will not receive this 5% fee back
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based.
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