At the risk of resurrecting an old thread - just wanted to say I'm getting this setup from James and having the guys at bimmerworld do the install/setup. Can't wait to see the results! I have a DE on 9/12 on the full course at VIR so I'll be able to post impressions at that time.
I did an event back in June on this config at VIR so I think I'll have a good reference point for commenting at least on feel. I don't keep up with lap times so I won't be able to provide empirical data on benefit. Besides, I hope to have a PFC front brake kit on by that time too so having two variables would probably make changes in lap times less relevant.
2013 Lime Rock M3 6speed, ESS VT1-550, ESS HFCs and exhaust, KW Clubsports, Fire Orange PFC Z31 BBK, Forgeline GA1R 19x10/19x11, Yoko AD08R 275&295/30/19, Apex EC7 w/Mich PSS 265/285, ModeCarbon GT4 Lip, UUC SSK, Performance Seats and CF Trim, GT Motoring Alcantara orange stich shift & ebrake boots, iND floor mats