Hey JCM,
Not to sound like a broken record, but I strongly agree that you just come out and worry less about whether you're in a class-competitive car.
Last year was my third trip to Topeka, but my first in SM2, having moved from C Stock most recently, and STS2 in it's inaugural season.
While I think autocross has one of the best types of participant bases for a sport anyway, SM2 was a very welcome class. C Stock is definitely fun, and I have some great friends from that class. But with that said, at Topeka last fall the SM2 guys, who didn't know me at ALL, were more than welcoming. Volyuntarily coming up and introducing themselves. Not at all stand-offish.
Additionally, after getting a taste of it at a national level, I was trying to get a sense of what it might take to step it up. Of course Chris (fellow Miata driver) is very open as, like me, he is just starting in SM2 nationally. But even guys in the top competitive cars, like Andy McKee, have been beyond helpful in the process.
I was never that competitive in C Stock nationally, so I have no delusions about being king of the hill in SM2, but that's here nor there. I will stay in SM2 and do the big events because it's a fun class, and has a great group of participants. I strongly encourage you to build the car you'll enjoy, then get it out there.
Paul Magee
45 SM2
Canton, OH