16-18 Focus RS MRT KR Cat-Back #91J000

2016 - 2018 Focus RS MRT Muffler Delete Cat-Back Performance Exhaust System 91J000
Quick Details
  • Fits: 2016 - 2018 Focus RS
  • Tune: None Required
  • Install: 60 Minutes
  • Premium Handcrafted
  • Made in the USA
  • T304 Stainless Steel
  • Badass Series
    Loudness: 10
    Drone: 2
    Performance: 8
  • Loud
  • Comfortable
  • Live It!
  • Add the Black Ops Edition for a high temp matte black stylish finish.
    List Price: $839.99
    Your Price: $699.99

    Price with Options: $699.99


    Product Details
    Badass Series : MRT Focus RS KR Cat-Back #91J000
    Loud, Aggressive, Take No Prisoners!

    Hear the Difference

    • How does it sound?
      MRT Focus RS KR Cat-Back #91J000 has a loud, deep muscle car sound.
    • Is there drone or resonance?
      Drone is comfortable and hardly noticeable.
    • What if I step on it?
      Wide open throttle increases exhaust loudness and tone to an balanced performance sound.

    Feel the Performance

    • What is the muffler design?
      Straight through design to provide maximum exhaust gas flow.
    • What is the tube diameter?
      Large 3" tube is used for reduced exhaust flow restrictions.
    • What are the performance gains?
      Reducing restriction and maximizing flow provide for noticeable gains.

    Get Noticed

    • What kind of tip is it? 3.5" double wall, polished T304 stainless steel tips with beveled edges.
    • What are my system finish options?
      Stainless Steel : No Finish
      Black Ops : Total System Blackout.
    • What are my tip finish options?
      Stainless Steel : Polished Finished
      Black Ops : Dual Tip Blackout

    Vehicle Application

    • Which vehicles does this fit?
      Fits 2016, 2017 and 2018 Ford Focus RS
    • What doesn't it fit?
    • Does it require a tune?
      No tune is required for this type of upgrade.

    Product Quality

    • What kind of steel is it made from?
      Corrosion resistant T304 stainless steel.
    • Where is it made?
      Developed and handcrafted in-house at our facility in Plymouth Michigan USA.
    • How long is the Warranty?
      Limited Lifetime Warranty (See Warranty Page for Details)


    • Can I install this myself?
      MRT engineers this Premium Exhaust System for a simple do-it-yourself (DIY) installation.
    • How long does it take to install?
      Installation time is about 1 hour and requires only common hand tools.
    • What is included?
      All necessary hardware included.

    Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 Write a review »

    5 of 5 Makes the RS sound like it should! July 18, 2017
    Reviewed by: Tyler Boes from Monroe, MI United States  
    This exhaust system gives the RS turbo noise, depth, and sound. Stock, the RS sound is lacking. Since putting this system on my car, I have turned way more heads. I have seen people jump in their seats when the exhaust pops in sport mode. Being 21, I usually drive the car pedal to the floor, but sometimes I do just want to cruise. This exhaust is easily controlled with the throttle. If you want to just sound normal, just drive it like a normal car. There is no resonator or muffler, but there is no drone at all. For gas mileage, I average at 25 MPG, and I don't drive the car like Grandma and Grandpa. This exhaust system also eliminates a major design flaw in the stock exhaust system. There is a point just after the downpipe where the exhaust forms a bout a 1 1/2 inch triangle for packaging reasons and tool/hand clearance on Ford's side. MRT eliminated this feature for a more open and better flowing exhaust system. I would absolutely recommend this system.