2008 550i dewaan import. (signature mein details hain). didnt get the M5 because with the options i had in my 550i the M5 would cost quite a lot. anyway a guy did 0-60 in a 550i in 4.8 seconds, so thats not bad 
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SUBHANALLAH...I haven't seen you sharing pictures of your 550 here? 
Though thats quite bad that the After-Market is very dull when in comes to 5 series, I mean no super-chargers even now? :-#