Size of exhaust pipe before cat

**ryanm** · 07-18-2011

I'm going to buy an electronic cutout just wondering what is the size before the cat before ordering? 2.25 or 2.5 for my 2005 GP GXP

thanks

**blueguy** · 07-19-2011

Factory is most likely 2.25".

Aftermarket GXP exhaust is 2.5" from what I've seen.

I'd save your money...cutouts are junk.

**Panther427** · 07-19-2011

You should get a Downpipe as the restriction is in the downpipes

**blueguy** · 07-19-2011

Or be a baller and get a set of Doug Thorley Headers...catless of course.

**ryanm** · 07-19-2011

Originally Posted by Panther427

You should get a Downpipe as the restriction is in the downpipes

what is a good brand of downpipe?

**ryanm** · 07-19-2011

Originally Posted by bluegtp91

Or be a baller and get a set of Doug Thorley Headers...catless of course.

I aint no baller just a shot caller!

lol

nahhh..that way out of price range...

**blueguy** · 07-20-2011

Hogan Performance downpipes are the best in the business for the 5300 WBody.

Thread: Size of exhaust pipe before cat