i know most of you are kidding about turbochargers ... but the moped army bbq race does have rules. all entries must be mopeds (no scooters) 50cc or less, no manual transmission. i have no idea if turbochargers or whatnot are allowed. i'd check on that.
but keep in mind that the race is through city traffic. so speed isn't the only consideration. you also have to avoid other cars and the police (last year two people were issued tickets).