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Kooks 1-3/4 in. Long Tube Off-Road Headers (15-17 GT)

AmericanMuscle no longer carries the Kooks 1-3/4 in. Long Tube Off-Road Headers (15-17 GT). Please check out 2015-2019 Mustang Long Tube Headers for an updated selection.
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Features & Details

  • Increases RWHP and Torque
  • Long Tube Header Design
  • Off-Road Connection Pipe
  • Free Flowing 1-3/4" Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • 3" Collectors w/ Scavenging Spikes
  • Fits Left Hand Drive Models Only
  • Fits 2015-2017 GT Mustangs
More Horsepower and Torque. A set of Kooks Long Tube Headers with off-road Connection Pipe will significantly improve the performance of your S550 GT. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging and reduces turbulence. As a result, it will improve your Mustang's exhaust flow over the restrictive factory manifolds, boosting your horsepower and torque numbers.

Quality Construction. These Kooks Long Tube Headers are manufactured from 1-3/4" mandrel bent 304 stainless steel tubing that merges into 3" collectors with scavenger spikes for superior airflow. These headers feature a leak-free ball and socket design for optimal performance and a better than OEM fit.

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

Application. These Kooks 1-3/4" Long Tube Off-Road Headers are specifically designed to fit the 2015-2017 5.0L GT Mustangs and is a direct bolt on to the factory exhaust system.

Technical Note. Not legal for use on pollution controlled motor vehicles; intended for off road use only.These Headers are intended for left hand drive applications only.

Fitment: 2015 2016 2017 Details

MPN# 1151H210

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (2) Long Tube Headers
  • (1) Catted Connection Pipe Assembly
  • (2) Gaskets
  • (2) Clamps
  • (16) Small Bolts
  • (8) Flat Washers
  • (4) Long Bolts
  • (4) Nuts
  • (1) O2 Connector
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube Type Mid Pipe Required: Stock Factory
Material: 304 Stainless Steel Finish: Natural
Catalytic Converter: "No" - For off-road use only Fitment: 2015-2017 GT Mustangs
Will it fit my Mustang?

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Customer Reviews (4) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Full Day

Installation Cost:$500-$1000

  • Performance Gain 4.75 4.8
  • Fit 5 5

  • 5/5

    Installation Time: Full Day

    August 06, 2018

    Installing 1 3/4 kooks headers

    I took the headers to a professional shop it took a full day I dropped the car off early in the morning and received it in the afternoon. I feel the difference after getting the headers installed and getting a tune I got tuned by Lund Racing and the car feels great its aggressive. Highly recommend getting these headers


    Year: 2016 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 06, 2017

    They are great but super loud.

    It's just way way too loud. It's practically not drivable in regular streets/roads. But since they are off road headers then it's fine but I will warn you now that if ur thinking of getting these for daily driving then just be ready to get some tickets and cops pulling you over cuz again it's just race car loud really but does sound really good.


    Year: 2015 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    July 07, 2017

    2015 Gt

    Great headers plenty of power with the correct tune.


    Year: 2015 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    April 08, 2016

    The sound of this is amazing. Loud but not overwhelming.

    Loud but not overwhelming. Very easy to install, the price is reasonable. I would recommend this to everybody.


    Year: 2016 Submodel: Ecoboost

    Helpful (1)

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