Okay im going to put a 350 in my firebird over the summer its going to be the TPI i was wondering if i buy the hedman X pipe,how do i use the emmsions stuff because only one side with the cat(passanger side) has the air pipe should a get a y-fitting and connect them with a pice of rubber?

 

The question you have to ask is does my locality have a visual inspection. If so, an X-pipe will not be emission compliant, especially with only one cat. You would be better off with a shortie header & y-pipe setup with a 3" hi flow cat & catback system.

 

single 3 inch exhaust on a 350 tpi with over 300 horsepower

 

Sure, why not?

 

Just didnt think that would be enough for a engine of that size.

 

I'm stuffing over 400Hp through a single 3" system. I'm switching to LT's and duals, but only because I love the sound of duals, and I have no emmissions.

 

What other goodies are in that 355? Using Flowtech headers would be really choking that 400 hp engine? Where did the 400 figure come from?