Buell XB 12 Dunlop Race Sport Motorcycle Replica by R-R CustomizeTechnical Specifications Buell XB 12-S Dunlop Race Replica by. RRCModel: Buell XB 12-S model year 2004Engine: StockAir cleaner: K & NExhaust / Mufflers: Stock header polished Sebring Twister muffler with RRC DB eaterInjection: Stock with Sinus power moduleClutch: Müller Power Clutch KittRear Wheel: