Try Dynasport. Tell them Dan w/ the e92 sent you. They specialize in Mini & BMW. I had some issues with tramlining after my upgrades and eventually they were were able to reduced them.
328i Sports Pkg, Hankook Ventus V12 (non-RFT)
. Wavetrac LSD (soon)
. 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