Active Autowerke has a number of affiliates across North America that are lisenced to do the reflash at their shops without the need to remove and send your unit away.
I checked this out with one of their dealers in Kelowna BC Canada and they match the price on the AA website for the software and chareg one hours labour to do the flash.
Their dyno results are slightly less than the claims in the OP's original post. About +12HP at the crank and +11ft lbs torque.
AA told me the dyno results posted on their website were performed by an independent shop.
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2004 325i - Sport package - 5MT- clears - CDV mod - M3 gauge faces w/silver gauge rings & red needles - SS exhaust tips - strut tower brace - Hotchkis anti-sway bars -50% tint - shadow grills - roof spoiler - silver CF trim