Genuine BMW Motorsport Shorter Rear Diff Ratio 3,91 The gear kit is direct from bmw Motorsport and comes shot peened, giving the gear set 25% more strength. Much sort after Motorsport ratio gear set, great for fast road and track applications. TO FIT: Small case 168L VEHICLES: E90 Models, 316i 318i 320i 325i E81 Models, 116i 118i 120i 125i MULTI FITMENT: Can be installed to various Limited-slip or open differential, with either M12 x 1.5 bolts or M10 x 1.5 bolts, we can supply bolts if required. We can also supply any other gear ratios you require. Feel free to forward a message. We also offer Professional installation of these gear kits along with full Differential Remanufacturing. We highly recommended that all gear kits are installed by a professional installer. We offer no warranty at all on this gear set so please make sure by enquiring first to check if this gear kit will fit your differential. Warranty: None No returns: Condition is "New". Dispatched within 48h via Courier