what would be best to get most hp out of our exhaust.

I know there are 3 cats, which cat should I delete.

I'm planning to keep resonators and mufflers on, but I heard it's the piping where the restriction is, should I get bigger diameter piping as well. Did anyone do anything like this, experienced any good or bad? Feedback will be appreciated.

 

look up dori crazy he got a complete exhuast from bigwave sc i also will have a complete exhuast with a sports header back soon.

but for a great exhaust u will need alot of back pressure and minimal bends to make great power the best piping is 2.25 or 2.5 inch piping anything over that will be over kill

 

well I dont think I'll be boosting anytime soon, I just wanna know which cat i should delete, and I wanna leave in resonators and mufflers if it doesn't restrict much just so my car doesn't sound like a fart can, 2.25 or 2.5 piping? does it make a difference, probably planning to BFI later on as well

 

what your boosting? Im sure those numbers are good for stock, how about turbo?

 

i dont have cats at all but my car has hell tq for a na still collecting parts for my swap

 

i think im gonna get a custom made straight pipe turbo back starting with 3 inch then going to 2.5 all the way to the mufflers. is the Y bend going to dual exhausts restrictive?