MMX Performance Billet Fuel Cap - BMWMake refueling great again! MMR Performances replacement Billet Fuel Cap is one of those upgrades that will delight you every time you fill your tank. Machined from solid billet aluminum, its lovingly hand polished and then anodized in glossy midnight black with a laser etched logo. It closes with a satisfying engineered 'click' each time you fill up. The design still allows you to prop the cap in the factory locater in the filler flap while you're