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, Michelin PSS on Staggered 18" OZ Ultraleggeras
. BMS Powerbox. Cyba scoops + charcoal delete. Wavetrac LSD
. M3: subframe bushings + sways + control arms. Meyle rear toe arms. M3 diff fr bushings
. BMW Perf: springs + v1 dampers
. Short Shifter + ZHP M weighted shift knob. CDV delete.