2015+ Mustang EcoBoost MRT KR Axle-Back

2015 - 2020 Mustang EcoBoost KR Axle-Back Performance Exhaust System 91U903
MRT 304 Stainless Axle-back: 2015+ Mustang Ecoboost #91U903
MRT Part# 91U903 Loudness: 10 Drone: 2 Performance: 8

Application: 2015 thru 2021 Mustang EcoBoost.
Tune: None Required
Time to Install: 60 Minutes
Retail Price: $712.78
Your Price: $593.99

Price with Options: $593.99

Availability: Usually Ships in 1 to 2 Business Days

Available Options:

Product Details Technical Specs Installation Instructions
The Mustang MRT KR Axle-Back system has a loud, deep muscle car sound and is handcrafted in corrosion resistant T304 Stainless Steel. Base systems include T304 polished SS 4" tips and 2.5" mandrel bent tube. Black Ops black matte tip finish is available for an additional fee. This system is engineered for the best sound to match your Mustang and provides increased performance from increased exhaust flow. The MRT KR is the loudest MRT axle-back. It is louder than the Interceptor and EcoFlow. This Badass series has just enough exhaust presence with elevated sound to Get Noticed, Feel the Performance note and packaged in a design without excessive drone.

Application: 2015 thru 2021 Mustang Ecoboost.

Hear the Difference
  • How does it sound? The MRT Mustang KR Axle-Back #91U903 has a balanced, deep muscle car sound.
  • Is there drone or resonance? The drone is noticeable but tolerable.
  • What if I step on it? Wide-open throttle increases exhaust loudness an aggressive performance sound.
Are you located close to Plymouth, MI and need your MRT aftermarket exhaust installed? Call MRT at 734-455-5807 to make an appointment today!

  • DIY installation for the backyard mechanic
  • T304 Stainless Steel for the best corrosion resistance
  • Engineered, designed and manufactured in the USA

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