Genuine BMW & MINI Parts. New BMW M135i Rear Diffuser. This is the ideal part if you are fitting twin exhaust pipes on your F20/F21 1 series MSport BMW.This will fit Msport model bumpers only. This will not fit LCI (Facelift) models. If you are unsure about the correct fitment for your car, please send us your chassis number and we will be able to assist you further. An authorised BMW & MINI Retailer. The item "New Genuine BMW M135i Rear Bumper Diffuser Twin Exit Exhaust F20/21 51128051928" is in sale since Friday, July 6, 2018. This item is in the category "Vehicle Parts & Accessories\Car Parts\Exterior & Body Parts\Bumpers & Rubbing Strips". The seller is "prenticeportadown" and is located in Portadown. This item can be shipped to United Kingdom.