gonna be putting in a carbed 350 with about 400hp, a set of shorty headers and y-pipe came with the car, and i threw out the catback, prolly gonna get a hooker catback or something, but my main question is how much do u think this setup ( cheap shorty headers/ypipe) will hold me back, in other words do u think this will kill power by alot or hardly?

 

also the single cat that is in the system will be getting hollowed out

 

alot. And engine like that wants Long tubes. Preferably with duals, but a single can work fine.