MRT Street Race Axle Back Exhaust (91J101) - 2013-2018 Ford Focus ST
Give your 2013-2018 Ford Focus ST the sound it deserves with the MRT Street Race Axle Back Exhaust. Designed to match the aggressive styling of the ST, this system delivers a bold, deep exhaust note that transforms the factory tone into a true performance experience.
Constructed from premium T304 stainless steel, this axle-back system features 2.5 inch mandrel-bent tubing to improve exhaust flow and reduce restriction. The straight-through design enhances throttle response and performance while producing a louder, more aggressive sound. Dual 4 inch double-wall polished stainless steel tips with beveled edges complete the look, with an optional Black Ops matte finish available for a stealth appearance.
The Street Race system provides a strong, always-present exhaust tone across all driving conditions. From startup to cruising and wide-open throttle, the system delivers an aggressive growl while maintaining manageable drone levels for daily drivability.
Features
- Aggressive Street Race sound profile with constant exhaust presence
- Constructed from corrosion-resistant T304 stainless steel
- 2.5 inch mandrel-bent tubing for improved exhaust flow
- Straight-through muffler design for enhanced performance
- Dual 4 inch double-wall polished stainless steel tips
- Optional Black Ops matte ceramic tip finish available
- Improved throttle response and exhaust flow
- Noticeable but controlled drone levels
- Direct bolt-on installation
- Engineered and manufactured in the USA
- Limited lifetime warranty included
Additional Notes
- Loudness rating: 8 out of 10
- Drone level: 2, noticeable but tolerable
- Performance rating: 8 out of 10
- Designed to enhance sound and performance over factory exhaust
Fitment
- 2013 Ford Focus ST 2.0L EcoBoost
- 2014 Ford Focus ST 2.0L EcoBoost
- 2015 Ford Focus ST 2.0L EcoBoost
- 2016 Ford Focus ST 2.0L EcoBoost
- 2017 Ford Focus ST 2.0L EcoBoost
- 2018 Ford Focus ST 2.0L EcoBoost
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

