my fiat brava 1.2 sx airbox screws have siezed i've tried alsorts to get the cover off to change the filter and i was wondering how hard/easy it is to remove the airbox and just buy another airbox or cone filter thingy.lol replace it with that. the screws are headed now and i've tried a screw extraction kit, to no avail.

lowering the airbox down through the access panel below it in the wheel arch may be difficult or even impossible with the lid fitted, but i have never tried it so i dont really know. give it a go.

Had the same prob with my air box. Opted to drill the heads off the two large bolts. Lid is still retained by outer screws.