Mugen Seiki MBX8R 1/8 Off-Road Competition Nitro Buggy Kit | Pro Racing Kit Mugen Seiki MBX8R - The Leading Edge in Nitro Performance High Traction Differentials. CFRP Suspensions. 4-Shoe Clutch. The Mugen Seiki MBX8R is developed to provide racers with a competitive advantage. Building on a legendary platfo..