[Michael9218]

Here are a few shots of my car to give you some ideas. I elected to build a half cage with door bars. The plinth at the footwell can be used to install a front hoop later if I decide. Obviously, this is a track car build not a race build, so I have no rules to be concerned with.

The E86 is a very interesting chassis that was pretty much purpose built for track use. Compared to the E36 and E46, it's much more structurally supported. If you're putting in a cage, be sure to remove the bulkhead. It's a royal PITA with 70 spot welds, but it's in the way and weighs 35 pounds. The main hoop can terminate at the shelf area to save some bar weight, but this will make X'ing the door bars a challenge. I opted for a single diagonal. The high door sills provide far more protection than the E36/46.