^ what he said.
The front wishbones are a very tight fit where they mount to the subframe. I found out that most installers grind a little off of the bushing (you can’t file it, it’s hardened steel; take off a few thousandths and they’ll slip in) so I had the mechanic do it after checking it was indeed needed. (Some have taken a file to the subframe instead, but it's the hard way).
328i Sports Pkg, Hankook Ventus V12 (non-RFT)
. Wavetrac LSD + M3 diff fr bshgs
. Short Shifter + ZHP M weighted shift knob, CDV delete
. M3 subframe bushings + f&r sway bars + control arms. Meyle rear toe arms
. BMW Perf: springs + v1 dampers