Man, you are getting serious now - I assume that you have decided to keep your car
Seriously, that does look like a clean setup. What kind of gains are you expecting? I would be curious about it being reversible also, important if you needed to bring it into the dealer for a problem.
I hear you on the tracking, I'm joining the CCA and would like to participate in some of their local events. However, I don't think I could bring myself to use the E92 on a track, as any f-ups on my part would be expensive to fix!