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I chose Dinan's stage 2 for my 2012 X5 50i. For me the choice came down to Dinan's warranty and the fact that a local BMW dealer is also a Dinan dealer.
I had a chance to drive a X5 50i with a Velos tune. It was fast. Honestly too hard to tell by seat of the pants compared to my truck. The owner was very happy with the tune and did not mention any issues to me.
I have heard good things about Dinan and Velos. Honestly, I don't think you can go farwrong with either one. Pro for Dinan = Dinan picking up the Warranty, Negative - you pay alot more for the Dinan warranty.
I guess the simple question you need to answer is:
Is the Dinan warranty worth the difference in price between the Velos and Dinan tunes?
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