1995 3.1L no MAF sensor?

[quakerj]

Found a 1995 GP at the junkyard yesterday, needed to get a speaker bracket off it.  Since I'm getting a MAF code on my car, I figured I'd grab a MAF off the car, but it was nowhere to be found.

Where the MAF is on my engine (just prior to the airbox), this had straight rubber/plastic intake duct.  No MAF whatsoever.  What gives?  Were there speed density (MAF-less) versions of this engine out there in the wild, and what determined whether a car got the MAF sensor or not, or was it a model year change.  This is a curiosity question more than anything, TIA.