I can't make up my mind on whiuch header and downpipe combo to buy. Anyone have any input. I really like the one from zzperformance. I am looking for the one I can get the most power from. Money isn't really an issue. I also would like to know what has to be done to remove the cat. Will I be able to pass emissions and will I have to reprogram the pcm. Thanks!!!

I have 06 SS/SC with Gm stage 2, gmpp exhaust, 2.79" pulley, and Injen Cai.

 

not sure about the header, but i'm using the 2.5" catless downpipe from cobalt-addiction, and im loving it, even on a stock muffler i've noticed much better flow and not to mention it sounds pretty good too