Not one email returned,phone call, or fax. Ya know they can shove there 523's where the sun don't shine.No jumping houses just breaking in on an open parking lot and one or two race weekends.Hey atleast return a communication from a customer,I was nice I just wanted to discuss the issue and see if we could come to some resolution. I shoud have wiped my ass with the $600.00 + invested in the engines and flushed it down the kamode.Since I can not get RB customer support to lift a finger I may part out the motors to recoupe some cash or mabey build a monument to take to each race to display the fine machineing and intricate port work thats totaly useless because both blocks are cracked that were mounted in two different cars and the trucks only ever saw a parking lot and a race track for less than a gallon of fuel Traxxas and OS customer support has been nothing but top notch. I hope RB contacts me just to acknowledge my concern.If not I could not in good conciense every purchase an RB product again and certainly not have anything favorable to say about them.