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Studio RSR Roll Bar for 2015-2020 BMW M4 Convertible (F83) Color:White 5i Special Edition (BM/BR) areThe Studio RSR bolt in roll bar for the 2015 2020 BMW M4 Convertible stiffens your chassis where it matters most, giving you sharper, more confident handling on track and a serious step up in occupant protection for HPDE, time attack, and weekend racing. It is engineered specifically for the M4 Convertible, so it follows the lines of the interior and bolts to the car's factory mounting points for a tight, purpose built fit. Designed and built in house