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Stainless Works Off-Road H-Pipe (11-14 GT500)

AmericanMuscle no longer carries the Stainless Works Off-Road H-Pipe (11-14 GT500). Please check out 2010-2014 Mustang H-Pipes for an updated selection.
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Features, Video & Details

  • Improves Exhaust Flow for More Power
  • Classic Muscle Car Rumble
  • Standard Length "H" Design
  • T304 Stainless Steel Construction
  • Intended for Off-Road, Track Use Only
  • Designed and Manufactured in the USA
  • Fits 2011-2014 Shelby GT500 Mustangs

Review & Installation Video

Review & Install Video

Improves Exhaust Flow. Increase the power at the rear wheels of your Shelby GT500 by eliminating those power robbing catalytic converters with a Stainless Works Off-road H-Pipe. This Stainless Works H-Pipe will greatly improve your Shelby's exhaust flow over the restrictive factory Mid Pipe to significantly increase your Pony's horsepower, torque and overall performance.

Muscle Car Rumble. This free flowing Stainless Works mid-Pipe for the 2011-2014 Supercharged GT500 not only increases power, but it also adds a deep muscle car rumble to the sound of your exhaust with its classic "H" crossover pipe design.

Superior Construction. Manufactured in the USA from T304 stainless steel tubing for strength and durability, Stainless Works mid pipes are mandrel-bent for superior airflow - so there are no kinks to rob you of power.

Application. This standard length Stainless Works Off-Road H-Pipe is designed to fit the 2011-2014 Shelby GT500 Mustangs with either the factory exhaust manifolds or aftermarket shorty style headers installed.

Technical Notes. This Stainless Works product is not legal for use in California or other states adopting California pollution controlled emission standards; intended for off road use only.

Fitment: 2011 2012 2013 2014 Details


CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Off-Road H-Pipe
  • O2 Sensor Plugs
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard length "H" Type Headers Required: Shorty or Stock Manifolds
Piping Material: T304 Stainless Steel Piping Size: -"
Catalytic Converter: "No" - For off-road use only Fitment: 2011-2014 Shelby GT500
Will it fit my Mustang?

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Customer Reviews (5) Write a Review

Overall Rating 4.2

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 4.75 4.8
  • Exhaust Note 4 4
  • Fit & Finish 3.75 3.8
  • Bang For Your Buck 4.2 4.2

  • 5/5

    Installation Time: Less than 1 Hour

    January 13, 2019

    h pipe

    Great product. Easy to install. There was a mistake on the first shipment. Had to wait extra week.


    Year: 2013 Submodel: GT500

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    June 16, 2018

    Unleash the beast

    Made the car extremely loud when paired with shorty headers and SLP loud mouths.


    Year: 2012 Submodel: GT500

    Helpful (11)

  • 5/5

    Installation Time: Less than 1 Hour

    April 04, 2018

    Excellent Product

    No bolts included for attachment at manifold and you cannot use factory. The flanges are smooth metal and factory bolts vibrate loose often. I had to go purchase lock nuts and washers. Do not get lock nuts with the plastic lock they will melt. Learned not from experience but from common sense. Pipes are incredible and I picked up 40 horsepower on Dyno. Factory Cats restricted performance. Definitely worth the 40 horsepower. Get the pipes before next race. PS. No tune needed for the 40 rear wheel horsepower. It took me approximately 1 hour to install.


    Year: 2013 Submodel: GT500

    Helpful (11)

  • 3/5

    Installation Time: Full Day

    February 17, 2015


    Good things: fitment, finish, material and delivery. Noise: very loud without cats and straight piped all the way out the back; but, too much drone inside of car. Will have to added some mufflers to tone it down just a little. Bad things: no plugs were supplied for the extra oxygen sensors locations and spent (3) hours running around town trying to find plugs that would fit properly.


    Year: 2012 Submodel: GT500 Leavenworth, KS

    Helpful (14)

  • 3/5

    Installation Time: Afternoon

    August 22, 2014


    Overall I'm happy with the exhaust it is more raspy at high rpm than I would had liked. I put this on and kept the original axel backs and original headers. I did this because I didn't want a drone on the hwy and it's there but it's perfect. You can have a conversation in the car with out a problem. Installers beware there are two extra O2 sensor holes that the car does not have sensors for. You need to buy bolts to plug them up with I was upset because I had already taken my OE pipe out when I realized and had no other car to go get them with. Stainless works should provide the plugs or at least put a big orange paper in the box notifying you that you need to get additional parts before installing. Also this mid pipe makes your tail pipes stick out about a half inch past the bumper. It doesn't look bad it actually gives it an aggressive look but just FYI.


    Year: 2014 Submodel: GT500 Pompano Beach, FL, USA

    Helpful (13)

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