Yeah Dave, that's where I was hoping this thread would lead to. From the little I've read, if you're getting one, get the passenger side. I've seen pics of cars running 'em on both sides. Why run one and not two? Must be the majority passes on the passenger side. So then the next question is how much passes on the drivers side?
What I've always been curious about is, what kind of issue is being caused? How bad is it to not have one of these???
After ~300 miles (on my stock 3V), I already had about a teaspoon of oil in it. I can definitely say it works well. (our Steeda billet oil separators)
http://www.steeda.com/store/mustang-oil-separator.html
I love steeda and trust them totally. However, I have to recommend the JLT piece because its plug & go and takes seconds to install . The steeda separator requires you to cut your stock lines and splice the separator which is a pita. The jlt comes with the pvc lines already connected and spliced to the separator. You can then keep your stock lines for whatever or in the event you ever go back to stock. I originally ordered the steeda but returned it when i learned this fact about the 2 different products.