I've got a 92 mm Lab Grade MAF sensor and filter built by Professional Mass Air Systems.

I bought this new and used it just for turbo testing and logging. It's still like brand new and I have all the paper work and calibration information here to go along with it.

This currently sells for $394, which seems less than when I originally bought it.

Here is a link to the site for the MAF:

http://www.promracing.com/mass-air-meters-c-2/pro92-p-6

Here is the complete unit and paper work I have:





I'll take $200 for it.

 

Sold!