I'd go with the B14 but it lowers the car quite a bit as the minimum drop is 1.5" F and 1.3" R. If being too low is an issue, the bilstein and HR sport combo is great. I would most definitely install both at the same time. Why pay for labor twice? Also the ride will be okay with the stock shocks but will be a bit bouncy and you'll wear out your stock dampeners much faster.
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F36 435i * MINERAL GREY * ///M Performance | G01 X3 * PHYTONIC BLUE * ///M40i
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