I'll be darned if this is not one of the highest if not the highest mileage Z4M on here.
As you are turning this into a track monster I would question why you have chosen to go with the following parts:
- TMS ARCA with a rubber bushing end and not the solid tie-rod end
- Stock FCAB and not a monoball
- Polly subframe bushings and not solid alloy
- Stock RTAB and not a solid monoball design
Maybe it is something to do with your racing class rules?
Looks like you have decided to go for monoball front camber plates and RSM so why cheap out on the other bushings?
Not sure if you might have forgotten to mention the RCA - Upper Inner Bushings. These also cop a real hammering and are also available in upgraded monoball designs for zero deflection.