I have a 2003 Cav Z24, what kind of gains would I be looking at if I where to add, Rsm 4 in 1 header, the Rms 62mm Throttle Body, with a full exhaust 2.25" High Flow Cat with 2.5" pipping cat back which would be going to single exhaust Ractive with 2.25 or 2.5" inlet...... I am looking for something like them type of bolt ons to give me the most hp I would like to try and get 150-160hp range..... I would be lookin to add more in the future but I am looking for highest numbers possible!

Thanks

you will get maximum 10 to 15hp. thats the max but you will loose alot with your 4 in 1 header system its only got for races in high output. 4-2-1 headers is your best choice.

Sorry my bad, yeah i meant a 4-2-1 header.... I would be happy with a 15hp gain, is there a programmer to get to modify the ecu on the car? try and increase stock hp without any mods.. like a piggy back system or something? If there is an increase for modifying the ecu what kinda gains would there be?