Congrats on the Nismo! i also have an 11' Nismo
iv been looking around for a intake for a while now myself and iv pretty much narrowed it down to either the Nismo R-Tune Cold Air Intake or the Stillen G3 intakes. with the Stillen intakes you have to chop up the fiberglass core support but with the Nismo intakes you have to relocate the windshield washer fluid reservoir. Both have solid dyno results and its pretty much down to pure preference of which you would like better and what kind of modifications your comfortable doing in the engine bay. im personally going with the Nismo intakes due to the fact that moving the windshield washer reservoir is much easier and reversible compared grinding at the core support with the stillens. Also, the Nismo R-tune Intakes are only available on 09-11 models making them kind of special for our cars
if your interested in looks i also prefer how the Nismo intakes look over the stillens. seeing the nismo badge on the intakes some how feels extremely satisfactory going along with the other nismo badges under the hood. it just seems right
if your on a budget, the nismo intakes are a little more than the stillens.
Nismo R-tune Intakes:
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https://www.z1motorsports.com/air-in...be-p-5809.html
Stillen Intakes:
https://www.z1motorsports.com/air-in...it-p-3847.html
I hope this helps!