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Old 08-24-2007, 09:49 AM   #1
foxboroxt
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Member#: 73104
Join Date: Oct 2004
Chapter/Region: NESIC
Location: Mansfield, MA
Vehicle:
2003 WRX wagon stg2
2011 Outback

Default OK to grind rear tranny crossmember for exhuast?

I'm trying to get a custom cat pipe to fit in with my exhaust, and there is a slight clearance issue with one side of the rear tranny crossmember, the cat hits it, and it messes up the fit at the donut flange (/| instead of ||). Would it be OK to grind out a bit of room there? How much would be safe? If looking at the crossmember from the side, the middle section looks like a n, and what I would need to do is to grind down part of one side of the n. Another option is longer hangers, but my SPT is low enough already with my STi wagon suspension, and I'd like to avoid the longer hangers as long as modifying the crossmember won't drop my tranny onto the tarmac.

As a public service announcement, a high flow cat in a race pipe is significantly louder than the stock 3rd cat, which I expected, but I'm also seeing higher boost levels. When I first took a drive with the highflow cat, my turbo wanted to spike a bit, but now it's settled down, and I've gained about a pound of boost at peak (16-17), and it holds at 14-15 until 7k.

Any feedback is greatly appreciated---
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Old 08-24-2007, 09:44 PM   #2
kalescustom
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Member#: 147598
Join Date: Apr 2007
Location: Colchester, VT
Vehicle:
95 Impreza 2dr
Black

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I had the same problem with my perrin downpipe on my 95 impreza.. I cut a chunk out of my tranny subframe and reinforced it with metal on the top... it works perfect...
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