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Originally Posted by Spacem5
So finally ready to add even more hp to the already outrageous 555. Am seriously considering ESS Tuning but came across some impressive you-tube videos of some retuned X5ms by PP Performance. Anyone have additional info about this tuner. Appears to be a reputable German tuner. Any North American shops that carry or install it?
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Speaking from experience, I would recommend a reputable tuner with a track record.
I am very happy with the Dinan tune, quite frankly I don't know how the car behaves without it because I had it done right away.
I will be switching to ESS when I purchase my catless downpipes and Akra exhaust.