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rust in muffler

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Old 03-15-2007, 05:13 PM
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i didnt find anything about this when i searched for it. the only thing that i found in the search that included rust was about wheels and brakes. but has this happened to anyone? i have an eisenmann on my car, and i just really noticed it today. on the bottom on the inside of the left tip, there's some rusting going on. what can cause this? anything i can do? any input is appreciated. thanks in advance.
Old 03-15-2007, 05:35 PM
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overheating from the welding of the pipe to the exhaust. You're basically sc$#@ed unless it is still under warranty.
Old 03-15-2007, 07:05 PM
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does it look like this?
http://www.m5board.com/vbulletin/showthread.php?t=91540
Old 03-15-2007, 07:24 PM
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Originally Posted by jet190rs' post='403355' date='Mar 15 2007, 08:05 PM
yeah it kind of looks like that, except more orange and white in color and is inside the exhaust tip.
Old 03-16-2007, 10:34 PM
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It's experiencing decarburization. It happens with 304 as it cools after welding. Chromium carbides form (the carbon bonds with the chromium).
Old 03-17-2007, 04:21 AM
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is it not the BMW muffler is made of grade A stainess steel
Old 03-17-2007, 09:58 PM
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i swapped the bmw muffler for an axle back eisenmann. anyway.. thanks for the input guys. jet190rs and that link he provided and black525i were right. thanks again.
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