Chuck is correct. The rotor diameters are smaller on the base brakes. To upgrade to the sports package brakes, you even need to cut or replace the dust shields. Z1 sells the kit or you can always wait until someone sells them on here. The Z1 kit is priced pretty well. You can do what some have done and upgrade the front set and back set separately.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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