We did actually come back to it and reinforced the front and rear subframe connecting points in multiple places. I just had an issue on my other car where the front sway bar stripped out of the subframe. That's a nice little setup on the M3.
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Originally Posted by Westersund
Love the build! 
I have a suggestion/recommendation regarding the rear FCAB however. The tie rod looks weak (same as the front inner as well) and I highly recommend some kind of reinforcement of the body at the rear pickup point (the inner front as well really). In the X an Y axis (horizontally) the body is fine but in the Z axis (vertically) the body will flex without reinforcing it, eventually the body will fatigue and crack. You're building a race car and the pickup points aren't designed for the kind of abuse you're gonna throw at it.
This is how it was done on my E46 M3 (it's designed by an experienced race chassi engineer who also drives Europes fastest time attack car):
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