It needs to be vented, even if it back into the intake. having both ports taken up by the rocker cover will cause excessive pressure in the engine and can blow smoke or worse push seals out
Well I hope you find him and I really recommend searching his name before sending anything to him as a thread the same as this comes up every 2 months like clock work
The biggest issue for a lot of people in the know is that it's not a Gtr, it's a gts4 with all the gaurds fitted. Which means no "bcnr" chassis number and for a lot of people that makes a lot a difference
http://www.skylinesaustralia.com/forums/topic/420706-any-sauers-in-dubbo/#entry6885817
It actually is the one by Chris and his first post is dated feb 2013 which makes 4 months old, sorry I was off on my time line