sounds good but dont take the attention away from your 528i. I think you would be much better off investing some of that money into mods for your 528. Maybe M5 body kits, exhaust, chip, M50 manifold.
Current standings: 98 M3 Track car
Mods: suspension, i/e/fly only
1/4th mile: 13.7@101 on 235/40 streets
Rd Atlanta: 1:44's on RA1's, 1:46 st.trs
95 M3 3.2obd1