I'm looking for increased performance for my 08 650i. Thinking of either cold air intake or Dinan performance upgrade. Any ideas
Big gains always take big money; the more you want, the more it's gonna cost. CAI's are a few hp - could be noticeable, maybe not so much. Probably not too many threads here on your specific car, you might find folks who've done CAI's on your car with results commentary on bimmerforums.com or bimmerfest.com. Dinan stuff is well executed & sometimes relatively expensive.
