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Hmm tough to say, but an interesting thought. There could be any small number of differences that are critical. In any case, I can tell you I've been very pleased with the Pbox. I don't really think about it being there day-to-day, but the other day I shut it off just for kicks (went to map "0") and it felt like somebody threw out the anchor. I don't care that much of the improvement is "only" throttle response and not big power gain, because in the environment where I do much of my driving (secondary and country roads), it makes the car so much more enjoyable.
That said, there is some power gain, and I'd like to augment that with more air - but don't want the awful rice noise of an Injen or the expense of the BMWP intake. Anyway, good luck with your car.
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