Has anybody installed one of these? If so, does it do what it states? Seems too good to be true for the money... or maybe I am too sceptical.

Performance Chip BMW M3 Z3 X5 1 3 5 6 7 8 Series 55+ HP - eBay Mod Chips, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 09-Sep-09 10:55:49 AEST)

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2004 3.0i X5 E53