I use to tune turbo's when I owned subaru's ... (WRX STI etc) ... when you tune a car like that you iron out lag pretty quickly.

I have a friend who did a remap on his 335i and it is a definite improvement ..I think the problem is that like most mass manufactured cars these days (yes, even BMW;s) the engineers try to strike a balance in terms of smooth performance / economy ... and in some cases its even worse as they apply a broad-brush factory tune to all models that's just plain sub-optimal ... (except M's of course - they get special attention)

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2010 35d Innovations
AW with great Tint

AW is the new black you know