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The HP2's higher 128bhp engine output comes thanks to a new DOHC layout working on larger (inlet 39mm, exhaust 33), radially placed valves (2 inlet, 2 exhaust). It also means the engine can now rev to 9500rpm max @ 8750rpm with compression up to 12.5:1 to help achieve the 84.9ftlb of torque. BMW als
