Hey Rich - you're exactly right, it's a breather set up. Under high RPM's the motor builds up internal pressure and the oil wants to go somewhere, at best out the valve covers. By venting the valve covers w a breather set up, you give it a place to go - typically a catch can w a breather on top. It's debatable, but I've been told internal crankcase pressure also robs HP...
I've seen a number of kits and do it yourself set ups. I'd bet Summit has one. Here's Peterson's version:
http://www.amazon.com/Peterson-Syste.../dp/B003M8M4VU