Help with Classing? Solo

Onelownismo

I'm having trouble figuring out what class my car should be in. I was running C stock, but I've sinced moved to STU and was told that wouldn't work. At the last event I ran, they put me into B Street Prepared.

When I look at the SCCA Rule book it looks like I can fit into STR (unfortunately my tires are too wide) or A street prepared.

My car has the following:

255 front tires (hankook R-S3's)
285 rear tires (hankook R-S3's)
BC BR Coilovers
Stillen CAI
Fast Intentions test pipes and catback
25 row Z1 oil cooler

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2009 Base w/ Sport - Fast Intentions - Stillen - Whiteline - BC - SSR - Enkei - Z1 - UpRev Tuned