Just my thoughts. It's been proven time and time again that 3" exhaust performs very well on the VQ35's. There are several Maxima/Altima dyno's performed on the forums I belong to that back this statement.
I would assume the same goes for the VQ37. Not familiar with the changes between the two, but I have a '08 Altima 3.5 6MT with Racingline y-pipe and "knock-off" 3" stainless cat-back exhaust (with resonator). Originally output to 2.5" inlet dual ricer watermelon shooters with 4" tips . Looked less than desirable and the cans had NO packing or perforated core. Too loud even with silencers in tips, so I am running stock 2" inlet axle back mufflers. Slight gurgle sound from exhaust and no in cabin drone.
It eliminated the 3rd cat. Performance gains were quite noticeable.