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The stock class for the the 335i is F, and the Street Prepared class is B. Because the piggyback probably affects boost levels, STU (Street Touring Unlimited) is not an option. Further, until the rule changes, the 335i isn't legal in STU because there is a single turbo limitation (expect that rule to change for 2009).
If the piggyback is all you've done, the car is probably way outclassed in BSP, depending on the competition in your region. But if you're a beginner anyway, it doesn't really matter. Go out, have fun and learn how to drive the thing. THEN worry about making the car competitive in BSP or take it back to stock.
Richard
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