well for the 128i you are going to need the sport package if you want to be competitive. If not you are going to have to shell out $$ for springs and good tires.
Also, which mazda are you talking about. The mazda3speed or the normal mazda?
2009 128i Coupe Crimson Red
MODS: -Injen Intake-Magnaflow Exhaust-Carbon Fiber Spoiler - Carbon Fiber Grilles - OZ Ultraleggeras - CF Mirrors