The breather bypass system helps keep oil from building up in the valve cover and thus starving the bottom end for oil. If you starve the bottom end for oil you may seize the rod to the crank and then destroy the engine.
The Faster Motors fitting for the side cover is improved in that it has a large Ferrell to keep the hose from slipping off. It also has a much more robust braided hose. The valve cover fitting can either be welded in place or you can make you own bracket to bolt it to the side of the valve cover. No wimpy rubber grommet that can tear or come out of the valve cover.
DOES NOT INCLUDE VALVE COVER