Curious about the roll bars myself also. When I had the red NB I was allowed to do the SCCA autoX stuff but no on track events. Ended up putting an actual roll bar in that to do a few track days.
Guess the NC and the rx8 share a similar platform so one of the first mods people do is rx8 antiroll bars. Probable going to pursue that but I’ve also got some Bilstein B8 shocks and Progress springs on order, think suspension package plus.
Aftermarket for these cars is amazing, rabbit hole for sure!