ive heard that drilling a very small hole at the end of the crack, and then filling the crack and hole with superglue will stop it. I haven't personally tried that, though. The idea is by drilling a small clean hole it will make it harder for it to start tearing again.

On a different note, how have your 300M's held up for you?

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.