2015-18 Mustang Roush Axle Back Exhaust V6/EcoBoost by Roush

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  • Roush Mustang Axleback Exhaust (2015) V6 421837
  • Roush Mustang Axleback Exhaust (2015) V6 421837
Roush Mustang Axleback Exhaust (2015) V6 421837
  • Roush Mustang Axleback Exhaust (2015) V6 421837
  • Roush Mustang Axleback Exhaust (2015) V6 421837

Improve performance & sound in your 2015-2018 Mustang with this Roush Axle Back exhaust kit!

Item #RSH-421837
MPN# 421837

Your Price: $595.99

Market Price:$625.99
You Save 4.79 % ($30.00)

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  • Aggressive Sound
  • Increased Performance
  • Made In USA


  • 304 Stainless Steel Construction
  • 4" Tips
  • Mandrel Bent Tubing
  • Roush Quality

What's in the Box

  • (1) LH Muffler Assembly
  • (1) RH Muffler Assembly
  • (2) Exhaust Tips
  • (4) Exhaust Clamps
  • Installation Instructions

Made in the USA

Product Description

Roush Rumble
Add an aggressive exhaust tone to your 2015-2018 Mustang V6 or EcoBoost with this Roush Axle Back exhaust! This innovative new exhaust system from Roush features a hollow muffler chamber, as opposed to conventional fiberglass-packing. The result is a unique and less inhibited sound for your 3.7L or 2.3L engine with increased air flow, and increased longevity (there is no fiberglass that will break-down with time). Another great feature of this 2015-2018 Mustang Roush exhaust system is the lack of the in-cockpit boom normally found with performance exhaust systems at cruising speeds.

Top Notch Quality
Not only does this exhaust sound good, it looks good as well. The round tips are made from high-quality 304 stainless steel and are finished with a chrome flashing process. Conventional chrome plating uses layers of bonded chemicals to achieve its shiny appearance, which are susceptible to cracking and flaking especially when exposed to high temperatures (like exhaust). However, the chrome flashing used in this system is bonded micro-porously to the metal surface, and is as a result impervious to cracking from localized damage. This method of chroming is also resistant to heat color change.

-Fits 2015-2018 Mustang V6 and EcoBoost

ROUSH® Limited Warranty - Click Here

Product Videos

2015-2017 EcoBoost & V6 Mustang Roush Axle Back Exhaust Sound Clip

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Customer Photos (2)

Vehicle Applications

Ford Mustang - 2015 (15) - 2016 (16) - 2017 (17)

About This Brand

Roush - The Art of Performance Engineering
ROUSH Performance is the first specialty-vehicle company to combine race-proven technologies with advanced automotive engineering. The result, a unique mix of street car and race car...Is a ROUSH car. Or more specifically, a ROUSH Mustang or F-150 pickup with styling, performance, and handling characteristics derived from the racetrack and modified for street legal usage. The vehicles and components produced by ROUSH Performance are imprinted with Jack Roush's vision, passion for performance, and commitment to excellence. He personally approves the design, engineering, fit, finish and overall performance of each package, ensuring that his personal standards are met prior to production and product release. Many of these products are designed by the same engineering group that has helped Roush Racing become the winningest Ford racing team in history.

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