I've had my S2 for a few hundred miles now and plenty of WOT sprints and so far zero check engine lights or issues. Car hauls ass from standstill to triple digits. The only time i feel like i want more power is when I am already on the highway traveling at a decent rate (60-80) of speed and you romp it. The difference is less dramatic then.

The only thing i could complain about is during part throttle cruising and you give it more throttle without flooring it you can sometimes feel the boost build up (more power) then go down (boost oscillating) ever so slightly. I can only feel this if the car is staying in the same gear and you give it a certain amount of throttle.

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Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More photos of my car here