Having a PCV system is a good thing for performance as well as for the environmental folks. In performance applications the catch can is also a great thing. Real performance cars take it further and install a vacuum pump to evacuate crankcase. The reason it's on one side versus another has to do with the rotation of the crank. Unfortunately Flickr has dropped the hammer and all 17,000 of my pictures are now inaccessible. That's where I had a lot of good reference material. I have back-ups, just not handy. I'll take a look when I'm home and see if I can post something.