You didn't specify air or oil filter.
The OEM is no doubt badged Nissan for both. I KNOW the air filter is because I replaced it with a NISMO filter.
I use K&N Performance Gold for my oil filter. It is highly rated and definitely high quality. The best? I don't really know but I'm very comfortable using K&N.
K&N is also the filter used by Steve Millen racing in the just-released cold air intake system for the G35 sedan and coupe.
Ken
