Question about Header...
I have a pretty much stock '00 Civic Si...and I am wondering if I buy a Greddy SP2 exhaust right now, should I also buy a header. How much more performance will I get with a header than with just the SP2?
Originally Posted by JoePannone
you will probebly gain about 5 hp with the header and exhaust. its wise to free up the whole exhaust .
So buying an exhaust like the Greddy SP2 without the header is not very useful?


