Re: Air filter / induction replacement ?
You could try repairing the airbox. Mine had one snapped-off bolt and one captive nut turning inside. I drilled these two captive nuts out and put long M6 bolts in their places, from inside the box pointing upwards. These were held with nuts on top, which I heated up first to make them sink into the top of the air filter box so they didn't stand proud. I then tightened up the bolts with loctite on the threads. The top of the filter housing is now secured with the one original bolt that had not rusted, and two nuts on the new bolts sticking up.
To answer Neil's question, a MAF failure can give different symptoms on different cars, but generally it'll be rough running. When mine went I lost all power below about 5,000 r/m (mmmmm, smell that clutch) and the engine kept cutting out (always in the middle of busy road junctions).