Those are the upgraded hoses to separate the banks. So one bank doesnt affect the other anymore on the vacuum side. Very high crankcase vacuum in the N engines. Almost double the M engines. The valvetronic causes that engine to have barely any intake vacuum (since the valves barely open when idling). Hence the need for the vacuum pump for thre brake booster. Strange that there is so much crancase vacuum and barely any intake vacuum. Who knows...The typical upgraded hoses do not have that one ccv on them. I believe that is for an n62b48 but only on a very specific application. I cant think of it right off hand but have seen it before. Those replacement pipes are pretty expensive. I am always so careful when removing the old one.