Do I need a new downpipe or can I reuse my stock one?

Stock downpipe outlet diameter will determine compatibility. Verify the outlet flange matches before purchase—some owners use the factory unit, others upgrade to a larger diameter for flow gains. Test-fit or contact your Honda specialist if unsure.

What prep work is needed before installation?

Drain coolant and disconnect the battery. Remove the factory manifold, clean the gasket surface, and inspect for cracks or damage. Install fresh gaskets between the header and cylinder head—do not reuse old ones.

Will this require tuning or a check engine light?

Header swap alone typically does not trigger codes on stock vehicles. If you're adding other intake or exhaust work, an upstream oxygen sensor relocation or tune may be necessary. Stock tune usually adapts after a few drive cycles.