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Beautiful cars. Thanks for sharing.
In my experience, once the subframe on the e46 M3 starts cracking, it will continue to crack, even after it's "reinforced" with plates.
The load simply goes elsewhere. The subframe fix in these cars is extremely problematic because to truly address the issue, you have to weld plates into virtually all areas of the subframe. Using a good epoxy on the inside of the subframe is a must, as well.
All off-the-shelf solutions out there with "plates" simply aren't enough. Sooner or later, other parts of the subframe will crack. And if they don't, rest assured that the load will be dispersed elsewhere. Something is always taking the "hit".
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