Thanks for the info on the restrictors. Looking around at the prices for those too, they are all at least $15 unless you can knock the shipping off by ordering more stuff. Seems kind of ridiculously priced for something that small but I suppose you have o-rings in there too. About the Mugen body, will any of the MBX bodies work? I would assume that the body mounts wouldn't really change as they went from one to the next. Thanks.