From the 240Z onwards, the Z has had an enviable competition record. With National Championships for almost every model from the S30 through the Z34, the Z has been viewed as an overdog for some time now. The SCCA competition racing board (CRB) currently has given the Z34 and the Z33 (HR-powered) one of the highest weight penalties (cars must weight 3400# with driver) in the T3 class. The VQ37VHR must also utilize air restrictors (50 mm) to limit top end.
Of course, there's other classes where you can race the Z unrestricted and at a lower weight, but you get to take on cars like the C7, Ferrari 430 comp. Porsche 997 GT3 and the like.
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