Cast stainless steel construction built for the Civic SI and RSX platform. This header replaces the factory cast-iron unit with corrosion-resistant stainless that flows cleaner from the combustion chamber to the downpipe. Engineered for bolt-on fitment at factory mounting points.
Do I need a new gasket when I install this?
Yes. Use a fresh header gasket at the cylinder head flange — reusing the old one risks exhaust leaks. The factory gasket compresses over time and won't seal properly against the new header.
Can I bolt this directly to my stock downpipe?
Depends on your downpipe. Most OEM downpipes mate at the standard flange, but test-fit before final tightening. If there's any gap, you may need a reducer or custom adapter — we recommend checking fitment before ordering a full exhaust system.
Does this need to be painted or coated after install?
No. Stainless steel doesn't rust in exhaust heat, so bare stainless is safe long-term. If you prefer a finished look, high-temp ceramic coating can be applied, but it's optional for corrosion protection.
Products are direct shipped from Supplier.
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**Rates from 0%-36% APR. Payment options through Shop Pay Installments, are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers https://www.affirm.com/licenses.