Running a GD (WRX/STi) Cat-Back Exhaust on a GC8 (93-01) - Page 10 - Subaru Impreza GC8 & RS Forum & Community: RS25.com
 
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Running a GD (WRX/STi) Cat-Back Exhaust on a GC8 (93-01)
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Old 08-08-2010, 10:49 PM   #91
ShinY05
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so if i wanted to run an sti catback on my 05 rs i would need this correct?
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Old 08-10-2010, 07:14 PM   #92
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I went to a muffler shop today, and when they went to test fit the 07 STI catback on my 98 RS, they said that the flanges wont bolt up because the STI flange was too big and wide.

Also, the gap between the cat and the midpipe is at little more than an inch, so they couldn't weld two flanges together like the op did. Are all RS cats the same length from 98 to 01? And are all sti catbacks the same from 04 to 07?
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Old 08-10-2010, 08:06 PM   #93
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Quote:
Originally Posted by tofuboi86 View Post
Also, the gap between the cat and the midpipe is at little more than an inch, so they couldn't weld two flanges together like the op did.
When I did mine, I had to weld in a 3" extension into the midpipe. You've got to cut the midpipe anyway to rotate the flange. Mine's from an 05 STI.
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Old 08-10-2010, 10:31 PM   #94
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Quote:
Originally Posted by vermont22gt View Post
When I did mine, I had to weld in a 3" extension into the midpipe. You've got to cut the midpipe anyway to rotate the flange. Mine's from an 05 STI.
The weird thing is, when the tech lined it up with the axelback to compare, there was only a 1 inch gap between the midpipe and the cat, not the 3 inches that seems to be the norm.
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Old 08-12-2010, 07:05 PM   #95
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And I just discovered today that the RS (Canadian spec 01 anyway, as well as the OBX header that will be going on) has 3.75" Spacing on the fwd flange where as an 03 WRX has around 3.90".

Can anyone chime in on the mid-pipe dimentions for a 2.5i? MY gf is away with the wagon, but I'd like to get this sorted soon.

Anyone want to buy some mid pipes. I've got 2 now.
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Old 08-20-2010, 11:14 AM   #96
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will more of these be available? been driving around with a dump between the driver/passengers seat for a while, with the wrx exhaust in the hatch.

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Old 11-15-2010, 12:21 PM   #97
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n/a gd catbacks still fit perfectly on gcs dont they?
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Old 12-09-2010, 07:38 AM   #98
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found something useful!

havent had a response in a few months on when or if these will be available, so after doing a bit of searching, this is what i have found.

this might be a bit different for your own application, but this is what worked for mine.

97 outback sport with stock cat-back removed.
- stock exhaust removed and cut the remaining few inches from the front exhaust flange.
- ordered a 2 1/2" exhaust flange from online *can be found for under $20*
- take car with WRX exhaust and old "cut" flange with new 2 1/2" flange to exhaust shop.
- let them install the WRX exhaust and bolt in / and align old flange and new one.
- they weld the flanges together

drive away happy!

cost?
around $20 + what the exhaust shop will charge *usually under $30* and drive down the road.

Vibrant Exhaust Fabrication - J-Spec Header Flange Kit - JDM parts: Honda, Toyota, Nissan - Japanese aftermarket and performance car parts <--- similar to part I found online via google search!

hope this helps anyone still working to put a different exhaust system on their car!
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Old 03-15-2011, 01:47 PM   #99
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Old 03-15-2011, 02:48 PM   #100
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My exhaust shop cut the stock flange off my mid-pipe and welded it onto the 2.25" pipe I provided. That would clear up any donut gasket issues you're having.
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