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Do you mean a PH1 airbox? Some people say they make 1-2bhp at the top end. I get the feeling they may loose some low end grunt, but with enhanced noise. Do whichever you like, niether will utterly transform the car, but both are goo dproviding the filter element is decent quality or new oem.
Yeah doesn't really matter tbh, I personally have the ph1 but I'm not bothered either way. Could do with getting a ph1 elbow as mines tight too but been like it over a year no problem.
When I had a phase1 box on mine, I drilled the rivets out that held the two inlets on, and removed them. Leaves one big hole like a v6 box. Not that it makes any difference