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Optional: Pillowball Upper Mount Spring Rate - Front 16 Kg/mm Spring Rate - Rear 18 Kg/mm Damping Adjustment 2-Way Custom Spring Rates Available upon request Notes Front upper mounts being offset Vehicle Fitment
2013 BMW 3 Series AWD Wagon (F31)
2011 Suzuki Kizashi AWD (GF)
2009 INFINITI M35
1959 Porsche 356A (Type 356)
Studio RSR Roll Bar for 2021-2026 BMW M4 (G82) Colt Plus Optional: Pillowball Upper Mount SpringThe 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
