The BMW X class rules aren't technically fair but what can you expect from a club that is really supposed to tend to BMWs? It is what it is.. In any class in any club( even more evident with ST class in scca with the killer '89 civic si's) one car will end up being the best for the job.. For what it's worth, Anthonys S2K is far from stock, he runs STR which is a street tire class but he had r-comps on for this event and killed everyone. One of the next closest time/car in comparison was Brian Hair in an STR Z3M(on street tires). For the sake of comparison on your car and his, I don't think(not 100% sure) that 350Zs are allowed in STR. SCCA puts them in the same class in stock form, but after that I *think* they part ways..