i'd skip all that stuff on your list. dinan throttle body is ridicuously expensive and will net you 3hp? all aftermarket intakes besides gruppe m are inferior to stock imo. i'd focus my money on suspension and braking. unless you get a sc (which isn't available for the n52), you're not going to get any serious power gains.
if your car was not equipped with the sport pkg / button, i'd consider doing the sport button retrofit mod just for the throttle response. i know AA just released a tune and i'm considering that but at 400, it's not that convincing...
and as someone mentioned, for $5500, you could easily get a m roadster and still have cash left over. makes no sense to spend that much on mods...
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