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1. There are much better autocross street class tires you can get for that price than the RT-615.. look into the RE-01R, Kumho Ecsta XS, or Dunlop Direzza Z1 *-Spec.
2. You will be fine with the 225/40/18... your speedo will be off by a little under 2% and you may notice more visual wheel gap, but there will be no performance or fitment issues.
3. Mods can just move this existing thread to the Autocross section, you don't have to delete/repost it :)
 
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