[SEAT TIME RULES]

I'm sure a few already have :-). If your looking into this go over to the M3/M4 F80 boards. There are several options out there and lots of info.

Pure Turbo
Kratos
Full Race
Doc Race
Weistec

If I was ever going to do this I'd probably go with Pure Turbo's...

I probably wouldn't even want this much power for track days.

IMHO around 550-600 WTQ (in 3rd+ gear) is the max the F87 Chassis can handle for road course fun. Trying to put more power down would be a chore for even an accomplished driver on road courses. That's assuming you have a well sorted chassis/suspension and 295/305 rubber on the rear axle

YMMV,
HAZMAT