just got it back today
e46 M3.... http://grassrootsmotorsports.com/forum/build-projects-and-project-cars/2002-bmw-e46-m3-trackcar-or-how-to-screw-up-a-dece/88751/page1/
Looks good. Did you do driver foot protection? I can't see it in the pics but - on these cars when they stuff in on the driver front, the floor is very thin with not too much structure and the wheel can intrude. If you don't have it... that tire can end up in your lap. This car had it - and you can see it was important...
Solution 1 - Tie the cage to the tower in a triangle:
Solution 2 - Tie the down tube and firewall together with a triangle and weld a plate on the end at the firewall (this one is not as good, but stock/spec class legal):
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