[williakz]

Why isn't there a tuning map to bring the stock 35i (300hp) up to stock 35is (330hp) performance? Surely the stock factory ECU programs are well known to the tuning elves. Can't the program from the 35is simply be applied to the 35i? Is it a copyright or patent issue? Or is it a matter that such an option might motivate the manufacturer to close the software tuning window for good?

I would think a "sHADOW" option or whatever nifty marketing name you give might be very attractive to Z4 buyers who are leery of going into more exotic Stage 1/Stage 2 territory. There's also the matter of a simple, compelling monetary comparison between the two models given the same option mix.