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I have a 2011 F10 N55 xDrive MSport, with full bolt ons and meth. I run the JB4 Stage 2 and it is all that you could want. The different maps allow you to adjust the tune to the modifications you choose to make to your car and their support is very good. I cannot speak to the actual dyno #'s because I havent dyno'd my car yet, but its a rocket and extremely fun to drive. I have not encountered a single person running anything else aside from Dinan, for me thats not an option because they dont even offer a tune for my car and the $2,000 price tag for the initial stage with additional costs for each additional stage, as compared to the one time price of around $500 for the JB4 with the same results or better from the JB4, I dont think theres even a reasonable comparison between the two. Obviously Im biased because Im using the JB4, but Ive done my research and looked at every other tune, including flashes, that are available for the F10 N55 and nothing has ever made me even consider dropping the JB4.
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