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? High Performance BMW S58 Engine 288¡ã/268¡ã | 10.30mm/10.15mm Valve Lift BMW M Series camshafts designed for S58 engines with bolt on intake, exhaust and turbo upgrades. For engines producing around 600-850hp running a 60-68mm turbo.? Maintains full use of Valvetronic and Dual VANOS for great throttle response and wide power band.? • Valve Spring Upgrade is Required, Kelford Cams recommend valve spring KVS58-BT.