Honda info needed

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@bgblockelcamino

may still be easier to build one from scratch
just going from experience
but if you have a honda header that will work for tubing and bends that you will need

Yep, you're right, primaries on my exhaust manifold are 4" center to center, doubt I can tweak piping that distance.

@Vapor Trail

or maybe see what the K series motors measure since the exhaust manifold is already in the rear it might be easier to just start with that.

I'm not famaliar with a K series motor.  What are they in, RSX?