I have taken my z3 to Sebring, Robling Road and Road Atlanta race tracks. I love the way it would build momentum as you flow the track. My best times have been Road Atlanta 1:22.06 / Sebring 2:13.59 / Robling Road 25.98. The only thing that has been done is some computer work, and air intake with proper maintance care; before and after track days
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