Will ITR manifold bolt to stock GSI Cat ?

**Andrew21** · 31-08-2006 01:02 PM

Q.1 -I got myself a AUDM 'Type R' Manifold which i will be bolting to a DC4 ( GSI ) Integra. My question is has anyone done this/ know - If the manfold will bolt straight up to the cat ? ( donut size / Flange angles e.t.c ) as i've heard it might not ? I know it bolts to the block fine, worried about the Cat section ?

Q.2 - Does anyone know what the actual size of the GSI stock exhaust piping is, im pretty sure its same as VTIR - Which from what i can see looks like 2 " ?

**bennjamin** · 31-08-2006 01:13 PM

its the same length etc but MAYBE the 2 bolts on teh flange maybe alittle offset.

**Slow96GSR** · 31-08-2006 01:22 PM

2.25" on the stock GSR but I could be wrong. I never measured mine before I went to 2.5" but I remember someone elsewhere saying 2.25".

**Andrew21** · 31-08-2006 01:28 PM

Hmm ok, well i suppose i'll just get under the car when i get a chance and TRY have a look and see how it sits, otherwise i'll just have to get a pipe welded from the cat to fit the manifold...**Hope it just bolts up though** MUCH EASIER...

**Felix** · 02-09-2006 12:48 AM

I think.

GSI is 2inch or 1.75, VTIR is 2inch. AUDM type R header is 2.25 i believe. Therefore it wont bolt straight on, but anyone with some welding experience should be able to connect it..
My numbers might be wrong, but definately GSI header and Type R header are different size.

**locote** · 04-09-2006 09:32 AM

Did you end up getting it put on???

**Andrew21** · 04-09-2006 01:53 PM

Nah man didnt have time with fathersday and all.. Might give it a shot tonite..

Felix - I know the headers (Runners)are different design/size however im pretty sure 2-1 Section that bolts up to the cat are the same size ( from what i can see anyway )...

**Felix** · 04-09-2006 04:28 PM

Originally Posted by Andrew21

Felix - I know the headers (Runners)are different design/size however im pretty sure 2-1 Section that bolts up to the cat are the same size ( from what i can see anyway )...

Nah they should be different. They might look the same size.
A pipe with a diameter of 2inch and a pipe with a diameter of 2.25/2.5 inch will look allmost the same to the naked eye, unless you put them side by side.

**locote** · 05-09-2006 08:55 PM

it wont bolt up the flanges dont line up..
Trust me ive had a ITR manifold fitted to my GSi

**Andrew21** · 06-09-2006 03:12 PM

Locote - Is that because the flange is on a angle... ?
Therefore all would be require is to cut the flange off the cat , fit to header at right angle, then re-weld back on to cat ?