When it comes to getting real horsepower out of your exhaust setup, Kooks Headers & Exhaust has been doing it longer and better than most. Founded in 1962 and still handcrafted in the U.S.A., Kooks is the name serious builders trust. Known for their aggressive tone, dyno-proven gains, and dead-on fitment, Kooks systems are built to handle high heat, high horsepower, and hard use.
From Kooks long-tube headers to Green Cats, X-pipes and full exhaust systems for Mustang, F-150, and more, Lethal Performance has the parts—and the knowledge—to help you build it loud, fast, and compliant where required.
Want to see the power of Kooks long tube headers yourself? Check out our 2024 Ford Mustang build in this short video for an in-depth look into our modding process and why we chose Kooks Headers & Exhaust for our build.
Kooks doesn’t mess around with generic sound kits. Every part they make, whether it’s a set of Kooks long tube headers or a full cat-back, is designed to increase flow, reduce restriction, and make real horsepower. These systems aren’t for looks. They’re for putting down real power.
The foundation of any serious Kooks setup. Built from mandrel-bent stainless steel and TIG-welded for strength, Kooks long tube headers are engineered to maximize scavenging and low-end torque. They’re available in a range of primary diameters to support different power levels and engine setups.
Kooks leads the industry with their exclusive Green Cats: eco-friendly, high-performance catalytic converters that don’t choke power.
Both are EPA-certified, forced-induction safe, and designed to cut emissions without cutting performance. No one else offers catalytic tech at this level; it’s a Kooks exclusive.
Pairing headers with the right mid-pipe is where Kooks shines. Options include catted and off-road (catless) setups, with X-, H-, and Y-pipe designs depending on your platform.
Kooks cat-backs are stainless, mandrel-bent, and tuned for aggressive sound without excessive drone. Perfect for bringing the system all the way back without bottlenecks.
Kooks is the go-to for:
From catted systems that keep things street-legal to full off-road builds that don't pull punches, Kooks gives you control over how your exhaust performs and sounds.
Kooks builds their headers and exhaust components for one thing: American muscle. If you’re running a high-output domestic platform, chances are Kooks has something that fits your exact year, engine, and power level.
Kooks is a staple on the Mustang GT platform, from the early S197s to the latest S650s. Whether you're bolting on Kooks long tube headers to a Gen 3 Coyote or building a full Kooks exhaust system for your Mustang GT500, we’ve got options that match your trim, transmission, and goals.
Yes, trucks too. Kooks supports Coyote-powered F-150 builds with long-tube headers and offers exhaust components for EcoBoost trucks and Bronco models (e.g., connection pipes, downpipes, and cat-backs) built for clearance and output.
From Camaro SS/ZL1 to C7 Corvette, and Charger/Challenger SRT, Kooks has long tube headers and X-pipe combos fine-tuned for Gen III HEMIs and LS/LT platforms. These aren’t universal parts; they’re purpose-built for each chassis.
Fitment Notes & Pro Tips
Still not sure which parts line up with your build? Hit us up; we’ll help you get it right the first time.
Thinking about upgrading to Kooks long tube headers, but still have a few questions? Here’s what most gearheads want to know before making the move.
Depending on your platform and supporting mods, gains of 15–30+ horsepower are common with proper tuning. Forced induction setups can see even bigger improvements in torque and top-end flow.
Not directly. Kooks headers are usually designed to work with their own Kooks X-pipes and mid-pipes, so mixing and matching with stock parts often requires adapters or custom work.
Yes. Each kit comes with the proper gaskets, bolts, clamps, and detailed instructions. If your application requires O₂ extensions, those are included as well.
Kooks Headers & Exhaust has been building race-proven, street-dominating exhaust components since 1962. What started as hand-built headers for drag racers turned into one of the most respected names in the performance world, backed by wins across NHRA, NMRA, and other top-tier motorsports series.
Kooks earned their reputation the hard way: by showing up at the track and outrunning the competition. Today, they still design and manufacture everything in the U.S.A., using premium stainless steel, precision welds, and platform-specific engineering that ensures your setup fits right and runs even better.
Kooks also pushes innovation where others don’t. Their exclusive GREEN Catalytic Converters are EPA-certified and designed to handle up to 1,000 horsepower while still reducing emissions. By combining advanced high-flow substrate technology with race-ready durability, Kooks has proven you don’t have to choose between performance and responsibility.
Whether you’re piecing together a weekend track setup or going all-in on a big-power street build, Kooks exhaust components are built to handle it. At Lethal Performance, we carry the full range of Kooks long tube headers, GREEN Catalytic Converters, X-pipes, mid-pipes, and cat-back systems, backed by real-world install support and the kind of tech advice you won’t get from a big-box site.
Need help choosing the right combo? Not sure if your setup needs tuning or supporting mods? Call us, message us, or shop by vehicle; we’ll help you get your system dialed in from headers to tips. And yeah, free shipping on orders over $100 is just how we do things.
