soo i think ima go with the gm extrude honed header...just wondering what downpipe i can run with this header...yes i know everyones going to tell me get the zzp header/dp combo but i wanna keep my warranty and chevy doesnt install aftermarket parts soo all gm parts for now...appreciate the help

need some hellppp lol

 

What size exhaust do you have? Do you have to keep the car within emissions cat vs no cat?
Any down pipe with out a cat would flow better then stock and any with an after market high flow cat would also work better then the OEM cat.

 

not sure about piping...ima check tomorrow if its a full exhaust or stock pipe and muffler..then ill let u know..and im def going no cat