agreed with all maximo and roelof......chocking the engines with stupid rules makes lough and cry .....when we are talking about noise lets check some supercars and superbikes and superboats ,,lets see top fuel dragsters ,,,i mean when big money is around there are no rules ,,,,,,and more and more all these useless rules are pushing new comers to electric rc toys ,,,,i wood say fricking noise and high rpms are for men ,,,,its what i keeping us around the rc engines ,,,,there can be some rules but killing the excitement is killing the rc nitro hobby...