I am trying to figure out what the model of Porsche is that I saw recently. It looked very similar to this 1979 model, but it also had a set of gills in behind the rear wheels as well as in front as shown. Any thoughs? I'm thinking it may have been a custom rear skirt/bumper, but I figured i'd ask the gurus first.

 

Thanks for the heads up, those seem to be much more traveled than this one.