Has anyone got any experience with a Removeable Hardtop for the 2000 Z3? Mine is actually a 2000 M Roadster, but would suspect that the tops would be interchangeable? Also, I have a HardDog Roll Bar, would the roll bar interfere with the Hardtop? Does anyone know if the Removable Hardtop would allow participation in HPDE events of BMW? I have run my vehicle with the Carolina's Porsche Club with no problem, except that my 6 pt harnesses were not allowed to be used as I did not have racing seats, and my front hook ups were on the side rails of the seats, and this was not allowed. My instructor said that the factory seat belts would be safer in this instance, and we used those, since I had both still installed in the car.