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• Fits ALL WHEEL DRIVE models only
to suit any cylinder modification with adjustments to frequency
The most popular of the Cusco bars is the Type OS
(1) 4340 Billet Crankshaft
BMW OEM Idler Pulley for G8X M2/M3/M4 (11287589361) ACT • Fits ALL WHEEL DRIVEThe drive belt idler pulley works with the tensioner pulley and tensioner assembly to maintain belt tension and guide the belt around engine accessories like the power steering pump, water pump, A C compressor, and alternator. Although often overlooked, the idler pulley is crucial for proper belt routing and function. It is generally recommended to replace the idler pulley along with the belt tensioner. Symptoms of idler pulley failure include visible
