I installed the Steeda oil separator on my 1989 Mustang GT. Only thing is, I installed it on the passenger side because there's to much going on under the hood, on the drivers side. Just for the record, my Mustang has no emissions equipment on it. I also had to get more rubber hose, because there wasen't enough in the kit. All in all, great kit, looks cool too.
Installed the separator in my '00 Mustang GT. Install was fairly simple. Picked up some various pre-molded 3/8" hoses from Autobarn that made the install look look like it came from the factory. In only @ 50 miles of driving there is a small accumulation of oil in it already. I would say this is a must mod to prevent this oil vapor, from the PCV line, building up gunk in the intake and valves, especially if you are supercharged or turbo.