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Old 09-13-2016, 07:43 PM   #1
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Where to buy new exhaust flange?

Does anyone know where I could buy new exhaust flanges for my 330i stock cat back exhaust? A while back I undertook the dreaded exhaust stud removal. After 2 days of drilling I finally got those suckers out of the headers! While I was under there I noticed that 2 of the bolt holes in the flange on the cat back side were almost completely corroded away (presumably from the exhaust leak at the bad gaskets).

Does anyone know where I could find just some replacement flanges? I plan to cut the old ones off and just weld some new ones on if I can find them.

Or if anyone knows where I can find a new exhaust for pretty cheap (saving for a house and don't want to dump too much into the car right now!) in florida I would be interested in hearing about that too!
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Old 09-14-2016, 10:04 AM   #2
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Old 09-14-2016, 06:31 PM   #3
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Unfortunately this isn't a standard "replaceable" part. This is on the cat back side of things right where it mates to the header. Attached are some pictures I stole from other places and marked up to show what I am talking about. These are welded on as part of the pipe. My plan was to cut off and weld on new flanges if I can find some.

Edit: after more searching I stumbled across this: https://www.summitracing.com/parts/vpe-1472s/reviews

Now I just need to climb under the car one of these days with some calipers to verify the OD of the exhaust at this location. Some forum posts claimed 2.5" for a 323/328 and 2.25" for 325/330.
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Last edited by TheRocketSurgeon; 09-14-2016 at 06:41 PM.
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Old 09-14-2016, 07:05 PM   #4
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Go to a pull a part place with a cordless sawza. Or ask your exhaust shop what they can do. Personally if it's working I'de leave it alone.
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Old 09-14-2016, 08:23 PM   #5
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I agree with leave them alone. Just be gentle when tightening the bolts down. Don't bother with the BMW studs. They are expensive and not needed. You may want to put a couple of washers on the bolts. The flanges are not a very weldable material.
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Old 09-14-2016, 08:49 PM   #6
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On my wife's E39 525i, it developed a exhaust leak there. Upon inspection the bolts were corroded down to a tooth pick diameter. I checked with several independent mechanics at a BMWCCA club meeting. Seems like they all to that! The suggestion was to heat the flange up red hot and hammer the stud out. Use a replacement bolts. A little harder to install since you have to hold both ends.

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330i, cat back, exhaust

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