Yeah, I'd also like to know WHY this should be done as a matter of maintenance and not just if any codes are triggered. What does it fix or improve ? How can you tell you might need it, short of any codes ? Rough idling is one symptom mentioned, anything else ?
328i Sports Pkg, Michelin PSS on Staggered 18" OZ Ultraleggeras
. BMS Powerbox + Wavetrac LSD + M3 diff fr bushings + Meyle rear toe arms
. M3: subframe bushings + sway bars + control arms
. BMW Perf: springs + v1 dampers
. Short Shifter + ZHP M weighted shift knob, CDV delete