Your one-stop performance shop for professional installation, maintenance, and performance services. From McLaren specialists to Mustang builds, we've got you covered.
🏭 Full Service Shop
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McLaren Specialist
Thorney Motorsport trained technicians for all McLaren models
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Mustang Experts
S550, S650, GT500, EcoBoost builds and installations
2015-2020 Mustang 5.0L 4V 2" x 3" Stainless Headers w/ GREEN Catted Connection Pipes and OEM Adapters. No additional parts required.
WHAT’S THE DIFFERENCE BETWEEN THE STANDARD CAT AND THE KOOKS GREEN CAT?
These two cats are physically the same, and both use the same 300 cell high-flow substrate. The difference is in the coating that is applied to the substrate. The coating on the Kooks GREEN Cat has more of the precious metals required to create the proper reaction to function as a catalytic converter in newer vehicle exhaust systems. This coating also helps the cat withstand the increased heat in higher horsepower and forced induction applications. The standard cats carry a 1-year limited replacement warranty (No warranty if used in a forced induction application). The Kooks GREEN Cats carry a 2-year limited replacement warranty.
Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off-road applications. Kooks has won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, they are proud to say that all of their products are handcrafted here in the USA and are proud to still be independently owned and operated. And don’t forget, “Get Kookin with KOOKS!”
Manufactured In The USA. Kooks Uses T304 Aircraft Quality Stainless Steel. Kooks Products are Backed by a Limited Lifetime Warranty To the Original Purchaser. Kooks Products Are Dyno And Race Tested and Designed For Maximum Power.
This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability, including fines
If it's in stock and ready to roll, your order usually hits the road within 1–3 business days.
For made-to-order or specialty items (like carbon fiber parts or custom builds), the turnaround can take up to 8 weeks — perfection takes time.
Either way, we'll keep you updated so you know exactly when your parts are leaving the pit lane.
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Do you send tracking with my order?
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Absolutely! Once your order ships, you'll get an email with a tracking link so you can follow its journey from our shop to your doorstep.
If your order ships via freight, you'll get a separate email with a direct link to the carrier's tracking page — easy and stress-free.
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What if my parts get lost or damaged?
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Things happen on the road — even to boxes. If your order arrives damaged, snap a few clear photos of the box and product and send them our way right away.
If your shipment is lost, just email or call us — we'll help track it down and guide you through the next steps to make it right.
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What can I do to help FFP?
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Simple — spread the horsepower! Follow us on Instagram, YouTube, and Facebook, and most importantly, drop us a review on Google or Yelp to let others know about your experience.
Your feedback helps us grow, create more content, and keep bringing performance-driven parts to the community. 🏁
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