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First of all let me start by saying I've got over 25 years experience at auto dealerships (GM), I now work for a large diesel engine manufacturer, I just attended a 2 day seminar on filtration, and I've been driving a VW for 5 years. The air filter seal on your car is a one use gasket, once it's opened it loses some of it's sealing properties. Dirt that gets sucked into an engine today will take thousands of miles to wear your cylinders and rings, not a big deal if you plan on selling, but not good for a long term investment. The same hold true for cleaning any media, it creates small, possibly microscopic holes, that provide a clear pathway for dirt to enter the engine. This includes banging, shaking, or forcing with air pressure or vacuum. Yeah, it'll run fine now, but in 20 or 30 thousand miles your compression will be lower, meaning less power, and less mpg's. To check the maf, simply unplug it. If the car does not run worse with it unplugged, it's bad. Unplugging the maf will cause a cel, but it will go off after x number of key cycles on it's own. Also, a maf can get contaminated due to bad filtratation. A maf should be about $80 US.
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