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I track on Stock wheels and have one set of 12mm spacers and one set of 10mm spacers. I have had these for a while but I will not put them on the car for the reasons Hack has stated. I bought them before I received an education on suspension geometry at the track from some Grand-AM mechanics.
I find that every older and wiser instructor that I have had in the Z4M Coupe (I can only talk about this car on the track), has remarked that with only some suspension alignment changes (camber, toe) that the basic car is phenomenal, and they love being in the car.
Since I have not switched to R-Comp tires or have installed coil-overs (yet), it will only get better.
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