Imca mod window opening

[racer22]

Has anyone had any dealings with the 12x12 opening on the passanger side. To clarify a little more doea your tech guy check at the window opening or do they check between the halo and the deck?

[3dracer]

For us in UMP land, they check the lowest point on top, which generally is the halo, to the highest point on the decking. The main parts that you must be able to squeeze by on exit.

[stock car driver]

12" round piece of metal like a wheel mud plug and they wave it around in there. 12" is 12"