im getting a new header and catback exhaust system for my hatch. it has a gsr engine in it now and i will be going all motor and plan to get at least 200 hp out of it, if not more. im looking at the comptech header and the n1 exhaust but do i also need a high flow cat or a test pipe? or does the header just bolt to the catback?

 

Im pretty sure your gonna still need eaither a test pipe or high flow cat! im almost 100% sure

 

Yes, you will need cat or test pipe.

 

so am i but i wanna be sure before i buy one. ill probably get a test pipe though.