This one is priceless - Electro Sound
http://www.unbelievablerc.com/detail.php?pid=10
Envious of brushless-running battery-heads? Want to drive your nitro vehicle in the cul-de-sac after hours without neighbors calling the cops? ElectroSound(TM) with engine noise dampener is what you need.
Scare nitro drivers -- if they think you're driving electric, they'll give up without a race!
If you can't afford an electric conversion, ElectroSound(TM) is the next best thing!