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Why do you think you will "spoil" the ride by welding it? I have a 2005 330CI ZHP daily driver with a welded diff that I skidaddle when it's wet...
I've daily'd a welded kouki and the only difference is the occasional churp on parking lots, which is fun, cuz it confuses people. Had a lady...
The M3 limited slips are not only uncompatible with regular e46 differentials, but you literally have to swap out the whole rear subframe for an...