Yes probebly its stopping the air some but not too mutch. The skylines are known for their heat problems. But the easiest way to solve this is to mount a big electric fan instead of the viscous one. if this dosent do the trick or you want to be sure of that it never vill overheat a new big raditor from ex ARC would do wery mutch that is coming on my friend R34 in a near future..
W