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I just got my 2013 28i fully loaded without DHP.
It gives me Eco, comfort, sport mode.
My car is still on the break on period with 587 miles on it. I tired the sport mode once, it only changes the transmission map or throttle which gives me a awesome jitter or something and it changes ur steering to a tighter one. So far I haven't noticed any suspension or chassis tightening.
The reason why I said I haven't noticed such things is because I came from 2012 35i with DHP. Had to return it because of the emission thingy.
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