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Dumpling, obviously i have no idea why you need a maf sensor, but is the car not running correctly? I had a similar problem with mine,and solved it by removing the unit and cleaning it thoroughly using an aerosol type brake/clutch cleaner. Also cleaned out the air filter,and touching wood,it appears to have cured it
If that is your problem,give it a go....its a whole load cheaper
Can I suggest contacting Grade-A Subaru Breakers cos I purchased a couple of MAF Sensors from them (when I had my prev 93 WRX) and I do belive the entire unit cost £80.