hopefully 3Racing will release the optional parts really soon then we don't have to go to these lengths to get our cars running sweetly. the belt tensioner they are going to release has more tensioning ability than the zero and the alloy hubs have less caster angle .5 I think off the top of my head.do you know what parts are interchangable e.g. are the ssk drive shafts compatible, on the rcmart web page they are listed under D3 hop ups, as is the tamiya 44mm Double Cardan Drive Shafts. I think dog bones just don't cut it!