Quote:
Originally Posted by A1337STI
Thanks for the info  and oops, i have a K&N Air intake kit which is what i'm wondering about . air intake kits are permitted in Street Touring, but after reading the manual last night it seemed like an STI can't be in street touring and would go up to Street Prepared in the "B" class ? Also I plan on just using the stock tires which have a tread rating of 140.
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Your STi is legal in STU, and in BSP with the intake. If you have engine managemnt like a reflash or Cobb AP (either of which I would highly recommend with any intake) then you would want to go to BSP so you can run altered boost and get full value from it. Plus, the only disadvantage that BSP has compared to STU is that you can't do brake upgrades, which aren't a big deal in the STi as far as autocross goes.