2002 MXZ-600 Adreneline, 2002 XC 600 Edge and 2002 ZR600 efi CC. Doo and Polo are studded, Cat has 1 1/4" track with no studs. After the Doo and Polo pull a slight hole shot (studs), my ZR blows right by them and I never saw them again until I stopped after about 1/2 mile. This happened time after time after time. Other than the studs, these sleds are dealer prepped only. I'm not saying this will happen with all 600's, but it sure does with these three. I won't even mention the SXR-700.