Header Install

[SiReal]

if my race header comes with a test pipe would it be legal to use that instead of the oem cat or would i need to use the oem cat or would it be better to get a high flow cat now since i got race headers?

depends on the inlet and outlet diameter of the car. I would advise you use a cat of AT LEAST the same inlet and outlet diameters of the adjoining header + catback. Otherwise your restriction will limit your sports exhaust.

A self header install on a b-series took around 1.5 hours to do, due to stubborn bolts. But being a K, not sure how you would approach it from the rear.