I've got a solo event this Sunday and I just got some FI HFC's but now I'm not sure what SCCA class my car is in. Everything else is stock (2007 G35x) and I was in D Stock before.

I also now realize I screwed myself and can't possibly be competitive in a modified class without dropping a couple grand in r-compounds / suspension / brakes

 

Your now ESP, good luck

 

You might be in STX or STU. STX and STU allows HFCs.

 

I went down to our meet last week and asked the guys there. Someone had a manual and showed me that I'm STX now.

 

What size are your MRR GT1 wheels, STX only allow up to an 8" wheel on AWD and I believe the MMR's are at least 8.5, I could be wrong