Originally Posted by dustman
What I didn't like about the m3: even with comp package seats, you fall out and around them far too much, ......
Once seated and ready to pit out - slide your seat back about 5 seconds. Ensure lap belt is snug. Then hook your left thumb under the upper seat belt and pull to lock the cam. Then adjust your seat 5 seconds forward. The upper belt should pin you into the seat back.
Use a different number of seconds to make it tighter or looser. Hang your wrist on the top of the steering wheel to check proper driving position.
You can augment this with a CG-lock: http://www.cg-lock.com/index.html