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Hey guys so i just bought a 2012 x5m just purchased a set of cat-less velos downpipes and im looking to do a tune just cant figuer out which one i was thinking renntech seeing they been in the game for a long time now but then there velos i hear from alot of people velos is the way to go what are your thoughts anybody have renntech tune.
 

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Try the BMW AG Motorsport old works team PTG engine builder Chris Fletcher or Herschel Brewer of Scottsdale Motorsports LLC on your S63 engine modifications 602-425-6611.
 
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