I test drove a 2000 ZL 500 EFI today. Started first pull, engaged around 4900-5000 rpm's. Ran pretty well, except I was a little dissapointed when I got on an open road and it only wound up to about 8200 rpm's. I've tested other similar sleds and they ran up around 8800-9000 rpm's. None of the previous sleds I tested though were EFI. Does the EFI not run quite as fast as the carbed model, or is there something wrong I should be questioning? Also, what do you guys think about the '00 ZL 500 EFI? It's also studded (96 studs). Would that slow it down that much? It felt like it was lacking some power compared to other sled I've ridden.