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Studio RSR Roll Bar for 2021-2026 BMW M4 (G82) Geo 2016 Mercedes-Benz C300 (W204/W205)The Studio RSR bolt in roll bar for the 2021 2026 BMW M4 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, 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 in the USA, every M4