Good info. and great to hear that you didn't waste $400. Have you had it "installed" yet?
As others have already said, the PPK 1 is a great upgrade. It's not going to give you numbers like other aftermarket tunes/flash, but I already knew that and really didn't care. I just knew that it would perform better than stock and that I would notice a difference. I had a feeling that low end performance would be noticeable, but what surprised me more was high end power. Accelerating from 70 all the way up to 90 mph was exhilarating. The car just keeps pulling. And the fact that it's from BMW and installed at my dealership just gives me peace of mind as well as retains resale value of the car.
'09 e90 AW 335i M-sport
BMW PPK 1 / BMW Perf. Exhaust and Gloss black grilles / 19" BMW 313 Perf. wheels / BMW Perf. aero side skirts and rear diffuser