The VR4s are the twin turbo models the other model is the SL (I think) they are non-turbo and slow.
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P.B.Y.M.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.