I just purchased a new Type-R cat-back exhaust and I will be installing it on my '94 GS-R. The B-pipe needs to be extended ~3" to mount to the stock cat. In the near future (3-9 months) I will be installing either a JDM Type-R 4-1 header or a DC JDM 4-1 header with a 2.5" flange, so I will also be going with a 2.5" hi-flow cat. So I figured will I'm extending the B-pipe I might as well weld on the 2.5" flange. So will a 2.5" exhaust flange bolt up to a stock cat flange?

Here is a picture of a stock cat and 2.5" hi-flow cat (image borrowed from http://www.sandmracing.com ):



Here is a picture of the 2.5" exhaust flange I'm referring to (image borrowed from http://www.sandmracing.com ):




D or Aleph, didn't you have a picture on your website which showed the 2.5" exhaust flange welded onto the stock exhaust pipe???


[Modified by BSQ, 4:02 PM 7/12/2002]

 

Yes, it'll bolt up.

It'll also be a nice bottleneck.

 

Can you clarify? What will be a nice bottleneck???

 

Yes... the 3 bolt flange has the same dims. as the stock stuff.

Willis


[Modified by Willard, 4:09 PM 7/12/2002]

 

The outer flange is the same, so it'll bolt up.

But the 2.5" hole will be mated up to a stock ITR catback.

That will create a bottleneck. Bottlenecks are always a bad thing.

 

Are you sure??

When I tried today to bolt up my ITR catback with the stock cat, it did not bolt on at all. Do the years of the ITR catback make a difference?

Btw, I drive a 95 Gsr.

Forgot to mention, I am using a USDM DC 4-2-1 and is there a j-spec type r b-pipe?


[Modified by VrInteg, 8:55 AM 7/14/2002]