Originally posted by Paul Kienitz:
I always did have a hard time believing that a header, by itself, could make any substantial difference...
I've been warned that certain exhaust mods, like gutting the cat, can lose power because it scares the computer into playing it safe and assuming something is not working right. Hopefully it would show a CEL if this happens, so you'd know.
Check these dynos on a ZX2. UDP was the only mod, but you can also see the gains of a header above the already installed mods.
http://www.zx2racing.com/stockdyno.htm Not "substantial" but about what would be gained with a superchip. About a 10% gain. Unfortunately, the company that made that header isn't around (at least I can't find their website).
