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American Racing Headers 1-3/4 x 3 in. Long Tube Catted Headers w/ X-Pipe - Long System (15-17 GT)

Market Price $2,408.99 You Save 13% ($314.24)
Our Price

$2,094.75 (kit)

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  • Item 389166
  • MPN# MTC5-15134300LSWC

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Features & Details

  • American Racing Headers Long System
  • Increases Rear Wheel Horsepower and Torque
  • Long Tube Header Design - 1-3/4"
  • High-Flow Catalytic Converters
  • X-Pipe Included - Eliminates Factory Resonator
  • 3" Mandrel-Bent Tubing (Steps Down to 2.5")
  • 304 Stainless Steel Construction
  • Intended for Off-Road, Track Use Only
  • Made in the USA
  • Fits Left Hand Drive Models Only
  • Fits 2015-2017 GT Mustangs with Factory or 2-1/4" Aftermarket Axle-Back
More Horsepower and Torque. An American Racing Headers Catted 1-3/4" Long Tube Header and X-Pipe Long System is engineered to increase the power and performance of your 5.0L coyote S550 Mustang. This American Racing Header and X-Pipe combo will significantly improve your GT Mustangs exhaust flow, when compared to the restrictive stock manifolds and resonator Mid Pipe, for a measured increase in rear wheel horsepower and torque.

Race Car Growl. The included X-Pipe not only eliminates the factory resonator to help increase power, but it also adds a loud raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

Quality Construction. American Racing Headers are manufactured in the USA from mandrel-bent 1-3/4" diameter 304 stainless steel tubing that merges into 3" collectors with scavenger spikes for superior exhaust flow. These long tube headers feature a one piece 3/8" header flange for additional strength, leak-free performance and an OEM style fit.

Required Upgrade. To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle highly recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Cut & Clamp Installation. American Racing Headers designed their 3" Long Systems to "step down" at the rear axle, which allows you to reuse your stock mufflers or the 2-1/4" aftermarket axle-back of your choice. Installation will require cutting and reusing the stock muffler assemblies and clamping them in place. Clamps and detailed instructions are provided.

Application. This American Racing Headers 1-3/4 x 3 in. Catted Long Tube Header with X-Pipe Long System is designed to fit both Fastback and Convertible 2015-2017 GT Mustangs equipped with the coyote 5.0L DOHC V8 engine. Requires the use of the factory or a 2-1/4" aftermarket axle-back exhaust for proper installation.

Technical Notes. Long tube headers are not legal for use on pollution controlled motor vehicles; they are intended for off road use only.These Headers are intended for left hand drive applications only.

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) Driver side header
  • (1) Passenger side header
  • (2) Catted connection pipes
  • (1) X-pipe
  • (2) Intermediate pipes
  • (2) Header gaskets
  • (4) Oxygen sensor extension
  • (8) Clamps
  • (1) Bracket
  • (16) Bolts
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube Type Mid Pipe Required: Included
Material: 304 Stainless Steel Finish: Natural
Catalytic Converter: "Yes" - For off-road use only Fitment: 2015-2017 GT Mustangs
Will it fit my Mustang?
  • GT - 16, 15, 17

These Headers are intended for left hand drive applications only.

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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Shop Install

Installation Cost:$1000+

  • Loudness / Volume 5 5
  • Exhaust Note 5 5
  • Fit & Finish 5 5
  • Bang For Your Buck 3 3

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $1000+

    August 20, 2017


    I paired this with the flowmaster outlaw axle back, some cutting and welding was required. But wow that quiet stock car now sounds like a NASCAR. You can definitely hear me coming now. The gaskets that come with it are cheap so I ended up buying oem gaskets. I also had a JLT CAI installed at the same time. It is a bit pricey but I wasn't going to put cheap headers on my new car lol It cost me $1200 to have everything done and it was $500 for the dyno tune, which I suggest because they save your stock tune.


    Year: 2016 Submodel: GT

    Helpful (0)

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