Carbon subframe from Montgomery is a wild light weight piece , designed for race applications . It might be okay for fitment on solo riding only imo . I and others have contemplated this piece for street application , and in my case , 130kg dressed , well , I chose not too . I went for the DME aluminum subframe , very well constructed , and fixing points for stock bodywork , whereas the carbon version I mentioned I believe is made to fit the race carbon bodywork Montgomery also offer for Busa .