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Something else to think about is that they updated the nav interface and program in the 2009+ models. My 08 has the older and dated looking interface. Also, I don't know about the 535s, but my 550 has a "sport" button just below the gearshift. When depressed, it firms everything up and you get a better response from the transmission. I believe I read that some of that acceleration hesitation is to provide a smoother ride. I've also heard that is can be fixed with a computer plug in thing (I can't remember the name) behind the pedal as it has to do with the drive by wire system. Lastly, I had a cooling system failure that is popular with these models. Luckily mine was covered by the CPO warranty. If I were you, I'd go CPO if you can. If not, get a good and thorough PPI as suggested by biz. Good luck.
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