Exhaust Piping Question

[EvadeTheBook]

Exhaust Piping Question

Hello All,

When I bought by R33 it came with a 3 inch cat back exhaust.  I'm planning on removing the stock cat and replacing it with a high flow one, either Venom or Catco High Flow Cats.  Both have 3 inch openings/flanges and I looked up the front exhaust pipe is only at 2.5 inches.  Do I need to upgrade the front pipe as well to 3 inches or will the 3 inch cat bolt up to the 2.5 inch front pipe?  If I do have to upgrade the front pipe to match up to the 3 inch cat....  Do I have to upgrade the turbo back pipe as well to 3 inches?  

-Nate

[KiwiRS4T]

It is a good idea to change the front pipe to 3in.

[EvadeTheBook]

Thanks for your reply, if I run a three inch front pipe, do I need to increase the size of the turbo back pipe to three inches as well? 

[Ben C34]

You don't have to do anything.

The bigger the exhaust is the better. A 3 inch pipe will bolt onto the stock dump

[vxsr33]

You might as well buy a 3 inch xforce/jjr front and downpipe replacement (less than $200)which will bolt directly to the cat and catback. I'd recommend a venom 100cell 5 inch body 3 inch inlet and outlet ($300). These are excellent quality and aren't restrictive

[EvadeTheBook]

Awesome, thanks gents!