I have tapped NPT 90 degree elbows into the sides of the front and rear valve covers, and ran them to an external PCV pulling vac from the top of the blower. Fresh air was drawn from a breather hose on the other side of the front valve cover going to the port on a northstar TB... To get it to function with a stock TB... you would have to build the stupid groove. or run an external maf on a stock TB with a fresh air draw between the blade and the external maf.