Guaranteed Free Delivery by 12/24! available on most items - Details

Talk to a Mustang Expert
Every day 8:30AM EST - 11:00PM EST
Win $3,000 In Mods!! Enter Daily!

Kooks Stage 8 Locking Header Bolts (15-19 GT)

Market Price $65.99 You Save 13% ($8.65)
Our Price

$57.34 (kit)

FREE Shipping

  • Item 399810
  • MPN# BK101

Will this fit your Vehicle?

In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features & Details

    • Locking Exhaust Header Bolt Kit
    • Ultimate Exhaust Header Security
    • Locks in Place
    • Won’t Back Out
    • Eliminates Leakage
    • Prevents Blown Header Gaskets
    • Includes All Locking Hardware
    • For Ford Coyote 5.0 Engines
    • Manufacturer’s Lifetime Warranty
    • Fits Ford Mustang GTs from 2015–2019
    Ultimate Exhaust Header Security. Regular exhaust header bolts are okay for regular engine applications but when you’re running some serious power through your Mustang GT’s Coyote 5.0 V8 engine and the pressure is really on, you simply can’t afford to have an exhaust header bolt back out. Eliminate leakage and the risk of blowing an exhaust header gasket by fitting a set of these premium Stage 8 Locking Header Bolts from Kooks. Everything you need is included and your engine’s performance will really thank you.

    Grade-8 4130 Alloy Steel Steel. Stage 8 Locking Exhaust Header Bolts are made from grade-8 aircraft-quality 4130 alloy steel and feature a duplex nickel finish. The patented three-piece system has a grooved bolt with a retainer piece and a spring clip. Once the bolt is securely installed, the retained goes over the head of the bolt and fits up against the exhaust header, with the clip snapping into the groove to provide a secure fit that can’t jiggle loose. From materials to design and engineering, your exhaust headers will enjoy a security of installation that can’t be beat.

    Manufacturer’s Lifetime Warranty. Stage 8 Locking Header Bolts are backed by a manufacturer’s lifetime warranty.

    Application. The Stage 8 Locking Header Bolts fit the Coyote 5.0 V8 engines in Mustang GT models from 2015 to 2019.

    Fitment: 2015 2016 2017 2018 2019 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (16) Locking Exhaust Header Bolt
    • Locking hardware
    Installation Info
    Tech Specs
    Will it fit my Mustang?

    You Might Also Like

    Customer Photos (1) Submit Your Photo

    View 1 Photo

    Q & A

    No questions about this product yet.

    Ask the First Question

    People Who Bought This Item Also Bought

    Customer Reviews (4) Write a Review

    Overall Rating 4.8

    out of 5 stars

    • 5/5

      November 28, 2018

      Works great

      The only thing is that I wish the bolts were also sold separately. I screwed up and almost had to cut a bolt off and I couldn’t find a way to buy just one. I like them and would have bought another whole set rather then put 1 regular bolt in.


      Year: 2019 Submodel: Bullitt

      Helpful (1)

    • 4/5

      September 28, 2018

      Great product, could be better tho !

      So i used these to install my StainlessWorks longtube headers on my 2017 mustang GT. They were well built, the locking mechanism is really clever and work well. The fact that you can tight them with an allen key helps in thight spots where a ratchet won't fit. The only reason i'm not giving it 5 stars is because of the way the tip on the bolts are made compared to the OEM studs. The studs have some guides on the tip to help to not crossthread them and enter the thread properly. The Kooks locking bolts on the other hand are just like regular bolts. So you gotta be carefull when you thighten them !


      Year: 2017 Submodel: GT

      Helpful (1)

    • 5/5

      July 12, 2018

      Locking Header Bolts

      Great product! Torqued to the right specs and don’t have to worry about them backing out. Buy with anti seize and you’ll be good to go


      Year: 2017 Submodel: GT

      Helpful (4)

    • 5/5

      April 03, 2018

      Nothing but the best

      High Quality part. No fitment issues. Simple to install. Used them when installing my long tubes headers. A must for anyone doing headers. I have the peace of mind knowing the bolts wont loosen up over time.


      Year: 2016 Submodel: GT

      Helpful (5)

    Related Mustang Categories