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I've done a number of PDX/HPDE events with my 3.0si Roadster and the only place where the Z4M makes a difference is as 3002 tii stated on the longer straights where the M will pull away from you. In most cases you'll still be one of the faster cars on the track, and since you really do these events for personal experience and you're not racing wheel to wheel, the 3.0si will provide more than enough challenge for you without the M premium in purchase price or maintenance.
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