Check the Dinan site for the latest prices and installation recommendations. I got mine during one of Dinan's periodic sales. For me, the experience has been subjective (I don't track or dyno the car)--very noticeable gain in performance / agility in all modes. The X6M is already an impressive maneuvering 5000+ pound car, it's now crazy better. I am very glad I got the software. I also got the Dinan exhaust and Dinan suspension at the same time. I think the total HP gains raise the total to about/ almost 620HP. The suspension feels fantastic -- handles tight turns/curves with complete aplomb, and yet with a very comfortable ride. Got it all done last OCT at a BMW dealership. Have had absolutely no problems.
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