I've autocrossed against quite a few, and let me tell you, the SCCA doesn't even put these cars in the same class. Numbers only mean half of the equation. The way the car is setup is everything, besides the driver. The NA crossfire, MT or AT, is in D stock. The latest generations of the RX8 are in B stock. If you can count and know your alphabet, I'll let you figure out how many classes higher they are. In an actual course, RX8's give a crossfire a run for it's money.