Hi Flow Cat

[OoskylineoO]

hey guys, i got a r33 s2 gts-4 NONTURBo lol and wondering what size cat i could fit onto my exahust system. would a 3'' hiflo cat fit? mayb with some adapters or something? i hav a 2.5'' catbak atm

Edited August 15, 2007 by OoskylineoO

[mad082]

the 3" would fit onto a 2.5" system.

[ignuz]

the 3" would fit onto a 2.5" system.

What about back pressure.. Is any/much lost through the different inlet sizes of the cat?

[R34GTFOUR]

What about back pressure.. Is any/much lost through the different inlet sizes of the cat?

a 3inch cat would be okay, as long as the rest of the system was no bigger than 2 1/2 inch, theres isnt a need for any larger on a n/a rb.

You can get all different sized cats (internally 2 inch, 2 1/2, 3 inch etc) but they are all the same length so they will fit in your current setup

[mad082]

there would be a bit of turbulence caused by the 2.5" flange on the cat back system, but not much and only at high rpm. to be honest, even without the turbulence i don't think it would make much difference. if anything just get a 2.5" cat of a cruiser. they are supposed to flow rather well. i'm pretty sure my mate used to run 1 on his worked r31.

[OoskylineoO]

thanks for info guys, 1 more thing, do the r33 turbo and non turbos have the same CATBACK set up?would a 2.5''catbak off a turbo r33 fit on a non turbo r33?

[MissR34]

my 3" stainless steel catbcak exahust is actually for and r34 gtt, and my car is n/a and it iftted fine, not to sure for r33's though