www.isuzuperformance.com
they sold header for 2.2 ecotec and i wanna know if it is a good choice,what extra gain
can i expect to win whit this header and high flow cat but whit the stock cat back?
should i replace all the exhaust line or keep my stock cat back is something that i can do cause i dont want the noise that produce a too big exhaust.

all advice are welcome.

if you are getting a header and high flow cat, you will need to get an after martket exhaust. you could stick with the stock exhuast but you are limiting the power you will get out of your header and cat. if you do not want it to be to loud get a resinator.

as far as isuzu header for an ecotec i don't know how good they are. sorry.

New sig in the works