What you (or he) need to look at is where the sub frame bushings bolt into the floor. Usually they'll tear out of the floor when can then break the actual sub frame or connected parts.
Sadly it's a very common problem with the year range car he has. As stated, there is a sub frame re-enforcement recall. We weld these plates in all the time. Just google E46 sub-frame failure.
BMW like every other single car out there have problems, period! Still pretty good cars. I like them because repairing them keeps me employed.
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