sweet they need to let the sound play thought the ac/dc bet the twin engine tractors sound evil, i use to race nitro cars on a 1200' vellodrome for fun a few years ago, i had my 1/10 scale 4wd running a little over 60 mph and my 1/8 just under 80, i got burned out on racing before maxing out the 1/8, i was doing 60 with the 1/10 and a . 12 motor when 50 was considered ungodly fast, me and a buddy found problems going that fast that nobody even thought of, like aluminum chassis warping from a combo of engine heat and down force (we started using titanium and carbon fiber parts to stop this), and tires flying apart, even the belted tires would tear apart after about 4 laps same for kevlar cap's, we wound up using custom foam tires that were light enough not to tear themselves apart from centrifugal force