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i've found that disconnecting the upper air feed from the std air box immediately loses you about 10% of your mpg (OBC readings). not sure if that's down to the reduction in cold air flow or bypassing of the acoustic valve (which you'd lose with an aftermarket filter box)
ok cool. only asked because i was sure i read somewhere that it wont fit phase 1's, and also to make sure before i stump up the cash and buy 1 only for it not to fit. oh and sry for the hijack of the thread