
Exhaust
2015-2026 Roush Mustang 2.3L EcoBoost & 3.7L V6 Exhaust Kit
Roush part # 421837
$729.99
Roush retail price · part only
Installed at our shop
est. $879.99
Part $729.99 + about 1 hr labor at $150/hr ($150.00).
Estimate only — shop supplies and sales tax not included. We confirm the final installed price for your exact vehicle before any work.
Fits: 2015–2026 Mustang
MustangInstalled at our East Bridgewater shop, or shipped anywhere in the US. Prefer to talk? 508-715-3554
- Genuine ROUSH Performance part, from an authorized Gold Dealer
- Installed by Ford specialists at our East Bridgewater shop
- Roush retail price. Installed price estimated up front, confirmed before work
Prices and availability subject to change. Prices updated October 2, 2026.
Details & specs
Product highlights for the 2015-2026 Roush Mustang 3.7L V6 & 2.3L EcoBoost Exhaust Kit:
- Fits the 2015-2026 Mustang with both the V6 3.7L & I4 2.3L EcoBoost engines
- Roush-designed high-flow mufflers with single inlets/outlets
- More aggressive tone over stock
- Made from corrosion-resistant high grade 304 stainless steel
- Full mandrel-bent piping for consistent flow
- 4" Flash-chromed dual wall tips embossed with the ROUSH logo
- Uses OEM hangars and mounting points
- Requires no welding
- Some cutting required
- Can be used with factory Ford rear valance
- Same exhaust featured in the Roush Level 2 Performance Pac!
- Includes all necessary hardware
- Roush 90-day parts Warranty included
Roush's Axle-Back Exhaust for 2015-2026 I4 2.3L Ecoboost and V6 3.7L Mustangs delivers a compelling solution for those seeking a significantly more aggressive exhaust tone and an enhanced overall appearance!
Ford provides a range of high-performance and cost-effective engine options for 2015-2026 Mustangs, catering to various budgets and preferences. Among these options are the V6 3.7L and I4 2.3L engines, which deliver impressive performance beyond their cylinder count. However, the stock Ford exhaust system lacks the bold and resonant tone that Mustang enthusiasts desire. This is where Roush Performance steps in!
Roush Performance has meticulously engineered this exhaust system to accommodate both the V6 3.7L and I4 2.3L 2015-2026 Mustangs. Crafted from T-304 stainless steel, this exhaust boasts exceptional corrosion and stain resistance. The mandrel bends ensure consistent high flow and reduced backpressure throughout its construction. Installation is hassle-free, as this exhaust utilizes factory mounting points and fits seamlessly on both V6 and I4 Mustangs without the need for any modifications or welding. Moreover, it significantly enhances your Mustang's sound and performance, featuring single-tip high-flow chambered mufflers. To top it off, Roush includes two brand-new round dual-wall exhaust tips, chrome flashed for superior corrosion resistance and proudly embossed with the Roush logo. The package comes complete with all the necessary hardware for a straightforward installation, and you can find detailed instructions under the "Installation" tab on this product page.




