I have a Blitz induction cover for sale for a 02-05 WRX/STi. It's a piece that replaces the bottom half of the stock airbox and in effect turns it into a short ram. Since it doesn't replace the MAF housing, it doesn't mess with the way the sensor reads. It works with the stock filter, as well as any other drop-in filter made to work with the stock airbox. I'm short on money, so I need to sell it. The piece sells for $130 for the induction cover and Blitz filter. I'm selling without the filter for $80 shipped. Used for about 2 days.

Here's a pic from Blitz' site.

 

dats pretty nifty

 

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