cakM3: Thanks for the warm welcome! You've already helped me answer some AVIN stereo questions, so much appreciated

Yes, the rear subframe cracks is something I definitely worry about. But the previous owner said his shop in Plano TX said he didn't see any cracks or signs of fatigue prior to selling it to me. I'll cross my fingers that I can enjoy my ZHP for a long while before it happens.

You would think BMW would be smarter with their design. Welp, can't have everything I guess. The only thing I've read why M3s are more prone is because of the higher HP, torque, and the inclination of M3 drivers to actually use it and thereby stressing the sheet metal out. Makes sense to me.