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Stainless Works Performance Off-Road Downpipe (15-20 EcoBoost w/ 3 in. SW Cat-Back)

Item 387451
AmericanMuscle no longer carries the Stainless Works Performance Off-Road Downpipe (15-20 EcoBoost w/ 3 in. SW Cat-Back). Please check out 2015-2020 Mustang Downpipes for an updated selection.
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Features & Details

  • Stainless Works Off-Road Performance Down Pipe
  • Increases Rear Wheel Horsepower and Torque
  • 304 Stainless Steel Construction
  • Free Flowing 3" Diameter Mandrel-Bent Tubing
  • More Aggressive Sound Compared to Stock
  • Intended for Off-Road, Track Use Only
  • Is NOT CARB Certified
  • Designed and Manufactured in the USA
  • Fits 2015-2020 EcoBoost Mustangs w/ 3" Stainless Works Cat-Back Exhaust
More Horsepower And Torque. Add even more horsepower and torque to the rear wheels of your turbocharged EcoBoost Mustang by installing a Stainless Works 3" Performance Off-Road Down Pipe. A Stainless Works Off-Road Down Pipe eliminates the power robbing factory catalytic converter to release all the hidden power and performance your S550 Mustang has to offer.

More Aggressive Sound. Stainless Works Performance Down Pipe not only helps increase power and performance, but it also adds a much more aggressive exhaust note to your S550 EcoBoost Mustang, when compared to the factory down pipe.

Stainless Steel Construction. Manufactured in the USA from full 3" diameter T304 stainless steel tubing for strength and superior corrosion resistance, this Stainless Works Off-Road Down Pipe is mandrel bent for superior airflow - so there are no kinks to rob you of power.

Required Upgrade. For proper operation and maximum power potential this Down Pipe will require reprogramming the vehicles computer. AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Application. This Stainless Works Full 3" Performance Off-Road Down Pipe is specifically designed to fit the 2015-2020 EcoBoost Mustangs and will require the use of a Stainless Works 3" Cat-Back Exhaust in order to be installed properly (see options above).

Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Off-Road Down Pipe
Installation Info
Tech Specs
Down Pipe Specifications
Piping Material:Stainless SteelPiping Size:Full 3"
Catalytic Converter:"No" - For off-road use onlyType Cat-Back Required:3" Stainless Works Cat-Back 
-Fitment:2015-2017 EcoBoost
Will it fit my Mustang?

    Customer Photos

      Questions & Answers (1)

      1 Top Rated Question

      Will the Stainless Works Performance Downpipe - Off-Road work with the borla atak catbck exhaust?

      • This downpipe is designed to work with the 3 inch Stainless Works Cat-Back Exhausts.

      Helpful (0)
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        Customer Reviews (1) Write a Review

        Overall Rating 5

        out of 5 stars

        Installation Time:Afternoon

        • Loudness / Volume 5 5
        • Exhaust Note 5 5
        • Fit & Finish 5 5
        • Bang For Your Buck 4 4

        • 5/5

          Installation Time: Afternoon

          September 13, 2016


          installed these on my brothers car and he has a borla catback all you hear is nothing but turbo spoil ! turbo spools up real quick downpipe is great quality as well.


          Year: 2015 Submodel: Ecoboost

          Helpful (9)

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