The crescendo and decrescendo of buzzing 200cc Subaru Robin or 270cc Honda engines swing through the interior of Grand Prix Raceway like a pendulum. The noise loudens as the Italian go-karts dart past the checkered starting line, then softens as they speed away at up to 35 miles per hour. Audible during races, parties, and leagues, the karts weave through a winding quarter-mile European-style racetrack that has a banked corner, computerized scoring and timing system, and enough width to drift through corners without bumping into cops.