Win A 2018 RTR Spec 3 Mustang Enter Now!
Talk to a Mustang Expert
Mon - Sun, 8:30 AM EST - 11:00 PM EST

3 Days Left for Free Shipping! Get it by Dec 24th available on most items - Details

Kooks 3 in. Competition Off-Road Full Exhaust System - Natural (15-18 GT350, GT350R)

Market Price $3,599.97 You Save 10% ($360.00)
Our Price


FREE Shipping
  • Item 393206
  • MPN# 1154F310

In Stock Ships same business day. Choose options to add to cart

Features & Details

  • Improves Exhaust Flow for More Power and Sound
  • Full 3" Exhaust System
  • Compatible with Factory Multi-mode Exhaust
  • Long Tube 1-3/4" to 1-7/8" Step Header with 3" Collector
  • Includes Long Tube Headers, 3" Off-Road X-Pipe and Matching 3" Cat-Back
  • Direct Bolt-On, No Cutting or Welding Required
  • Intended for Off-Road Track Use
  • Fits 2015-2018 Shelby GT350 and GT350R Mustangs
Improves Horsepower and Torque. Are you a GT350 owner who wants to uncork all the power and torque hiding inside their 5.2-liter Voodoo engine? Then you need to upgrade to a Kooks Competition Off-Road Full Exhaust System. Eliminating the restrictive OEM catalytic converters, Kooks engineered their Off-Road Exhaust with full 3" tubing from the headers back to greatly improve exhaust flow. This Competition Exhaust System is ideal for those looking to add even more tire smoking power to their 2015-2018 Shelby GT350.

Full 3" Exhaust Kit. The Kooks Full Competition Exhaust Kit is a complete 3" system from headers to tail pipes. This kit includes a pair of Long Tube Step Headers, an Off-Road X-Pipe, and a Cat-Back exhaust with adjustable mufflers. The mufflers exit in the same location as stock and reuse the factory tips located in the rear valance.

Long Tube Headers. Kooks Long Tube Headers are constructed from free flowing CNC mandrel-bent 304 stainless steel 1-3/4" primary tubes that step up to 1-7/8" and then merge at a 3" collector. The collector features scavenger spikes for superior exhaust flow. These headers feature a ball and socket design for optimal performance and a tight leak-free fit. Off-road connection pipes are included. 

X-Pipe; Race Car Growl. To significantly improve the flow of exiting exhaust gases, Kooks utilizes an X-Pipe which in return helps to increase power gains at higher RPMs. The included X-Pipe not only helps with power, but it also adds a raspy, race car growl to the sound of your GT350's exhaust with its modern "X" crossover pipe design.

3" Cat-Back. Kooks manufactures their Cat-Back Exhaust System from high quality 304 stainless steel piping for strength and corrosion resistance. Designed to out flow the factory exhaust system, this Cat-Back features mandrel bent 3" diameter tubing and a set of adjustable straight through mufflers. This Kooks Cat-Back reuse the factory tips located in the rear valance.

Compatible with Factory Multi-mode Exhaust. One of the coolest features of the Shelby GT350 is the multi-mode exhaust that allows the driver to select between normal and sport modes. Knowing that this was one feature that GT350 owners could not do without, Kooks designed their mufflers with the same style butterfly valves as Ford. When closed the valve blocks the exhaust flow, forcing it out one tip of the muffler to produce a more street friendly sound. When opened the valve "uncorks" the exhaust flow allowing it to exit through both tips of the muffler to produce an aggressive, throaty race style exhaust note. This Kooks Exhaust System reuses the factory valve motors.

Direct Bolt-On Installation. Kooks engineered their Competition System to be a direct bolt-on replacement for the original factory exhaust. There is no cutting or extra modifications required. Installation of this Kooks Competition Exhaust can be completed in about a day with just basic hand tools.

Calibration Required. Installation of this Kooks Competition Full Exhaust System will require the use of a Handheld Tuner to reprogram the vehicles computer (ECU) for operation. By reprogramming your Mustangs ECU you will be able to realize the full power potential that these Long Tube Headers have to offer.

Application. This Kooks Full 3 in. Competition Off-Road Exhaust System is designed as a direct fit bolt-on upgrade for all 2015 to 2018 Shelby GT350 and GT350R Mustangs equipped with the 5.2L Voodoo V8 engine. Will not fit GT models.

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

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) Driver Side Header
  • (1) Passenger Side Header
  • (1) X-Pipe
  • (2) Pipes
  • (2) Over Axle Pipes
  • (1) Driver Side Muffler Assembly
  • (1) Passenger Side Muffler Assembly
  • (2) Gaskets
  • (2) O2 Extensions
  • (8) Clamps
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube 1-3/4" to 1-7/8" Step Header with 3" Collector Type Mid Pipe Required: Kooks
Material: Stainless Steel Finish: Natural
Catalytic Converter: "NO" - For off-road use only Fitment: 2015-2017 Shelby GT350 & GT350R

Mid Pipe Specifications
Style Mid Pipe: "X" Type Headers Required: Kooks Long Tube
Piping Material: Stainless Steel Piping Size: 3"
Catalytic Converter: "No" - For off-road use only Fitment: 2015-2017 Shelby GT350 & GT350R

Cat-Back Exhaust Specifications
Piping Material: Stainless Steel Tip Material : Reuses Stock
Piping Size: 3" Tip Size: Reuses Stock
Muffler Type: Adjustable Muffler Fitment: 2015-2017 Shelby GT350 & GT350R
Will it fit my Mustang?
  • GT350 - 16, 15, 17

Customer Photos

You Might Also Like

Q & A

No questions about this product yet.

Ask the First Question

More Products You Might Like

Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Full Day

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

  • 5/5

    Installation Time: Full Day

    August 29, 2017

    Fantastic Exhaust!

    It is so loud, but a mean deep aggressive loud I recommend it to anyone


    Year: 2017 Submodel: GT350

    Helpful (0)

Related Mustang Categories