The advantage of the non-flanged version is that you can put a larger K&N filter on your car because with it flanged you will be really close to hitting the fender. On my car right now I have a 9" K&N and it is about 1/2" off the fender and I know that the flanged Pro-Flow is longer than the stock MAF so I would not be able to use my K&N. But with the non-flanged version, it is signficantly less long because you don't have the flange and the MAF adapter. Also, as Hoosier pointed out, it costs less. An unknown benefit for me.

Mark 95 Contour SE ATX Mods: A few mods with a few more to come