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welsh pit bike WPB 160cc 2WIN CRF70 2WIN OVAL Twin big-bore Exhaust system for an UNRESTRICTED , ULTIMATE and UNBEATABLE POWER Delivery to YOUR WPB Rear Wheel. THE 2WIN IS A MUST HAVE SYSTEM FOR GETTING THE TRUE POTENTIAL BHP POWER FROM A 160CC ENGINE. The Stomp WPB 160cc 2WIN CRF70 Frame is the ONLY and EXCLUSIVE Frame thats been Race Tested & Dyno Proven to handle the awesome Power of the SR YX 160cc RACE Tuned Engine. If you want 2WIN RACES it Simply has to be the New WPB 160cc 2WIN The WPB 160cc 2WIN is Unbeatable!