Next Level Performance
August 27, 2026 • 11 min read
Our Verdict
For most 2020-2024 C8 Stingray owners, the Kooks 1-7/8in stainless header system with GESI green catted connections is the best all-around upgrade — it frees up roughly 15 to 25 wheel-horsepower on a tuned car while staying emissions-friendly in most states. Z06 owners should step up to the Kooks LT6 Tri-Y set built for the 5.5L flat-plane V8.
Prices run from about $1,400 for a bare Stingray header set to roughly $6,600 for the fully catted Z06 kit. All six sets below are 304 stainless, in stock, and ship from NLP Performance in Tampa, FL.
Shop Our Top Pick →C8 Corvette headers are long-tube or mid-length exhaust manifolds that replace the factory cast units on the mid-engine Corvette to increase exhaust flow, add sound, and unlock power. On the 2020-2024 Stingray (6.2L LT2) and the 2023-2025 Z06 (5.5L LT6), the restrictive stock manifolds are the single biggest choke point in an otherwise free-breathing exhaust. Swap them for a mandrel-bent stainless header set and, with a supporting ECU tune, most Stingrays pick up 15 to 25 wheel-horsepower along with a noticeably deeper, more exotic exhaust note. In this roundup we compare six proven C8 Corvette header kits from Kooks and aFe, break down catted versus off-road options, and explain exactly which set fits the Stingray versus the Z06.
What Do Headers Do on a C8 Corvette?
Headers replace the engine’s factory exhaust manifolds with larger-diameter, smoothly mandrel-bent primary tubes that let spent gases exit each cylinder with far less back-pressure. The C8 leaves the factory with compact cast manifolds sized for emissions and packaging, not flow. A dedicated header set — typically 1-7/8in primaries merging into a 2in or 3in collector on these cars — scavenges exhaust more efficiently, which raises volumetric efficiency across the rev range.
On a naturally aspirated LT2 Stingray, expect roughly 15 to 25 horsepower at the wheels once the car is retuned to take advantage of the added flow, plus sharper throttle response and a deeper tone. The 670-horsepower LT6 flat-plane V8 in the Z06 spins to 8600 rpm, so it is especially sensitive to exhaust restriction — a proper Tri-Y header set helps it breathe at the top of that stratospheric rev range. Headers also shed weight versus the heavy cast manifolds and, in ceramic-coated form, cut under-hood heat.
Kooks 304 stainless headers replace the restrictive factory C8 manifolds.
Best C8 Corvette Headers for 2025 (Reviewed)
We selected these six sets from the brands we install and warranty most often at our Tampa shop. Each is 304 stainless steel; the difference comes down to fitment (Stingray LT2 versus Z06 LT6), whether the kit includes high-flow GESI “green” catalytic converters, and coating. Prices below update live from our store.
aFe’s titanium-ceramic coating keeps under-hood temps in check on the mid-engine C8.
Key Specifications — Kooks Stingray Header System
C8 Corvette Headers Compared
Here is how the six kits stack up on material, fitment, catalytic configuration, and price. “Green (GESI)” kits include high-flow catalytic converters that keep the car street-legal in most states; “header only” sets are off-road oriented and pair with your factory or a separate catted connection.
| Kit | Material | Fitment | Cats | Price |
|---|---|---|---|---|
| Kooks Z06 LT6 Tri-Y w/ Green Cats | 304 SS | 2023-25 Z06 (LT6) | Green (GESI) | $6,588.90 |
| Kooks Stingray SS w/ Green CatsTop Pick | 304 SS | 2020-24 Stingray (LT2) | Green (GESI) | $4,082.49 |
| Kooks Z06 LT6 Tri-Y (bare) | 304 SS | 2023-25 Z06 (LT6) | Header only | $2,925.00 |
| aFe Twisted 304SS Ti Ceramic | 304 SS + Ti coat | 2020-22 Stingray (LT2) | Header only | $2,461.00 |
| aFe Twisted 304SS | 304 SS | 2020-22 Stingray (LT2) | Header only | $1,852.00 |
| Kooks Super Street SS | 304 SS | 2020+ Stingray (LT2) | Header only | $1,425.35 |
Stingray LT2 vs Z06 LT6: Which Headers Fit?
The C8 Stingray and C8 Z06 use completely different engines, so their headers are not interchangeable. The Stingray runs the 6.2L LT2 pushrod V8 rated at 490 to 495 horsepower; the Z06 runs the 5.5L LT6 flat-plane dual-overhead-cam V8 rated at 670 horsepower with an 8600-rpm redline. Header primaries, collector geometry, and mounting flanges differ between the two.
For a 2020-2024 Stingray, choose the Kooks 1-7/8in stainless system (green catted or bare), the aFe Twisted 304SS (bare or titanium-ceramic coated), or the budget-friendly Kooks Super Street set. For a 2023-2025 Z06, the Kooks LT6 Tri-Y headers — available with GESI green cats or as a bare off-road set — are purpose-built for the flat-plane engine. Always confirm your exact year and model on the product page before ordering.
Kooks Tri-Y headers are purpose-built for the Z06’s 8600-rpm LT6 flat-plane V8.
Green Catted vs Off-Road Headers: What Is the Difference?
“Green cats” are GESI high-flow catalytic converters that flow far more than factory units while still scrubbing emissions, so a green-catted header system like the Kooks kits generally keeps a C8 street-legal in most states and helps prevent check-engine lights. “Header only” or off-road sets, including the aFe Twisted headers and the bare Kooks options, delete the mid-cats for maximum flow and the most aggressive sound — but they are intended for off-road or track use and may not pass emissions testing.
Our recommendation for a street-driven C8: run the green catted system. You keep the sound and the roughly 15 to 25 wheel-horsepower gain without risking an emissions failure. Track-only cars can save weight and cost with the bare header sets.
Off-road header sets delete the mid-cats for the most aggressive flow and sound.
Installation, Tuning, and What to Expect
Because the C8 is mid-engine, header installation requires dropping or lowering the rear cradle area for access, so we recommend professional installation — budget several hours of labor. Just as important, plan for a custom ECU tune afterward. Headers alone will make the car breathe better, but the measurable horsepower and torque gains only fully materialize once the fuel and spark tables are dialed in for the new exhaust flow; a tune also clears any codes from cat changes.
What We Like
- + 304 stainless mandrel-bent primaries flow far better than the restrictive factory cast manifolds
- + Green GESI cat options keep the C8 emissions-friendly while adding flow and a deeper note
- + Roughly 15 to 25 wheel-horsepower on a tuned Stingray, plus weight savings vs cast manifolds
Things to Consider
- – Premium price and professional mid-engine install labor
- – A custom ECU tune is strongly recommended to realize gains and prevent codes
Headers are the highest-return bolt-on you can do to a C8. Paired with a tune, a green-catted Stingray set transforms both the sound and the mid-range pull — it is the first thing we recommend to owners who want real gains without forced induction.
— NLP Performance Tech Team | Tampa, FL
Frequently Asked Questions
How much horsepower do C8 Corvette headers add?
On a 2020-2024 C8 Stingray, a stainless long-tube header set typically adds 15 to 25 horsepower at the wheels once the car is retuned, along with more torque and sharper throttle response. Headers on the naturally aspirated LT2 rely on a supporting ECU tune to fully realize those gains; installed without a tune, the power increase is much smaller.
Do headers on a C8 Corvette require a tune?
Yes, a custom ECU tune is strongly recommended after installing C8 Corvette headers. The tune optimizes fuel and spark for the increased exhaust flow, unlocks the full horsepower gain, and clears any diagnostic codes caused by removing or replacing the factory catalytic converters. Running green high-flow cats reduces the chance of check-engine lights but a tune is still advised.
Are C8 Corvette headers street legal?
Header kits that include GESI green high-flow catalytic converters, such as the Kooks catted systems, are generally street legal in most states because they retain functioning catalysts. Off-road or header-only sets that delete the mid-cats are intended for track use and may not pass emissions inspection. Always check your local emissions regulations before purchasing.
Will Stingray headers fit a C8 Z06?
No. The C8 Stingray uses the 6.2L LT2 V8 and the C8 Z06 uses the 5.5L LT6 flat-plane V8, and their headers are not interchangeable. Z06 owners need headers built specifically for the LT6, such as the Kooks LT6 Tri-Y set, while Stingray owners choose from the LT2-specific Kooks and aFe headers.
What size are C8 Corvette header primary tubes?
The Kooks C8 headers use 1-7/8in stainless primary tubes, which is a common sizing that balances low-end torque with top-end flow on the LT2 and LT6 engines. The Kooks Stingray system routes into a high-output 3in connection, while the Z06 Tri-Y set steps into a 2in collector matched to the flat-plane V8.
Why choose a Tri-Y header for the Z06?
A Tri-Y header pairs cylinders in a way that improves exhaust scavenging and broadens the torque curve, which suits the high-revving 5.5L LT6 flat-plane engine in the C8 Z06. Kooks designed its LT6 Tri-Y headers to help the 670-horsepower V8 breathe cleanly all the way to its 8600-rpm redline.
Ready to Free Up Your C8’s Exhaust?
Shop Kooks and aFe headers for the C8 Corvette Stingray and Z06, plus thousands more performance parts at NLP Performance.
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