Milltek Sport Cat-Back Exhaust - 2015-2017 Ford Mustang GT 5.0 Fastback S550

This Milltek Sport cat-back exhaust fits the S550 Ford Mustang GT fastback with the 5.0 liter Coyote V8, from the 2015 to 2017 model years. It replaces the factory system from the downpipes back, and you can choose between factory-style dual outlets or a quad outlet layout for cars fitted with a Roush rear valance.

A Coyote V8 already sounds good, so the choice here is mostly about how much more you want. The non-resonated systems use an X-pipe and are the loudest. The resonated systems use a front silencer in its place, which takes the edge off at highway speed. A valved quad system lets you switch between the two characters.

Every version is made by Milltek Sport in England from T304L stainless steel, with 70 mm (2.76 in) pipework and adapters that connect to the factory downpipes.

How to Choose

Dual outlet systems keep one tip on each side, in the factory cutouts, with 100 mm GT-100 tips. Pick Non-Resonated for the loudest sound or Resonated for a calmer cruise.

Quad outlet systems use two 90 mm GT-90 tips on each side. They need a Roush rear valance with quad cutouts, which is not included, and fitting the valance is extra work. They come non-resonated, resonated, or valved. The valved version has a valve in each rear silencer and comes with Milltek's Active Valve Controller, so you can switch between a quiet mode and an open mode.

Tip finishes are polished, Cerakote black, brushed titanium and burnt titanium. Burnt titanium is offered on the dual systems and on the valved quad system.

Features

• Dual or quad outlet layouts
• Non-resonated X-pipe, resonated or valved versions
• T304L stainless steel, 70 mm (2.76 in) pipework
• Adapters for the factory downpipes included
• Not a race-only product, according to Milltek

What's Included

• Dual Non-Resonated: downpipe adapters, X-pipe, left and right axle pipes, left and right single-outlet rear silencers, two tips
• Dual Resonated: downpipe adapters, front silencer, axle pipes, single-outlet rear silencers, two tips
• Quad Non-Resonated: downpipe adapters, X-pipe, axle pipes, dual-outlet rear silencers, four tips
• Quad Resonated: downpipe adapters, front silencer, axle pipes, dual-outlet rear silencers, four tips
• Quad Valved: downpipe adapters, X-pipe, axle pipes, rear silencers with valves, Active Valve Controller, four tips

Specifications

Fitment Notes

• Fits the 2015-2017 Ford Mustang GT fastback with the 5.0 liter V8.
• Milltek lists this system for the GT fastback only, not the convertible, the EcoBoost, the V6 or the GT350.
• The 2018 refresh changed the rear valance and exhaust layout. If you have a 2018 or newer Mustang, contact us before ordering.
• Quad outlet versions need a Roush rear valance, sold separately.

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.