I'd take the 550 every day over the 535. MSport, power, etc.
I test drove both back to back, and the 535 didn't compare. My wifes 335i has the PPK on it and it scoots well, the 550i still pulled way nicer.
After looking for awhile I settled on a Dinan 550i, cause even though stock has nice power, I am a power whore... Pick it up Sunday, can't wait..
Matt
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