4" diameter for a significant presence and great sound

combined with a radiused inlet and unique S&S stinger allow smoother faster airflow for more power

83-89 GR 650 D 650cc

Center width: 4

complete with 3/8-24 threaded mount studs

saddlemen gel channel track carbon fiber sport seat for bmw BS90 4" diameter for a significantSaddlemen Gel Channel Track Sport Solo Seat for BMW Designed for riders who push limits, the Sport Seat with Gel Channel technology brings the perfect balance of comfort, performance, and aggressive styling. Whether you're hitting twisty roads, the track, or just commuting, this seat delivers lasting comfort and control youll feel from the first ride. Features: Gel Channel design relieves perineal pressure and improves blood flow for longer rides