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I have one on my 3.6L, and didn't pay anywhere near $400 or even $250.
I can't speak to whether it makes more HP, as I've never used the stock airbox.
My PowerFlush(tm) intake made 2HP over the PowerFlow setup on the dyno. The PowerFlush(tm) moves the air cleaner out of the back of the engine compartment, where it can breath cooler, fresher air.
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"You go to the track with the Porsche you have, not the Porsche you wish you had."
'03 E46 M3
'57 356A
Various VWs
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