whats the diffrence than the exhaust mainfolds and headers. How much gain will headers give on a 2.8L, I heard some good old fiero boys made some and got zero gain with them on their cars. Also I her some a weird hissing from near the manifolds if I push on the gas, not real load but annoying.
Thanks

 

The hissing I would guess is a exhaust leak. It will rob you of some power. I have a crack in my manifold now but it isnt leaking....yet. Gotta get that fixed!


Edit: let me get this straight...You have T/A ground effects, spoiler, and a 2.5 inch cowl hood and you have a 2.8L? Tell me you don't have T/A badges!

 

I junkyard hop alot. I'm not putting TA badges on a normal Firebird it just ain't right. Also I got that fiberglass Hood and TA Front end from my buddy for around $300 thats with the front GFX pieces. The hood goes for like $300-$350 without shipping too.