For you track junkies who would like to keep crap out of your front opening. I installed a Nissan MotorSports Mesh Grill. Part number 62851-RTZ40. List is $438.89. Phone, 888-833-3225. Took 6 months for me to get this thing.
The install is simple. Drill 4 holes. And use 2 screws to hold it in place. It's shipped flat. You have to gentle bend it to fit the bumper contour. It took me about 2 hours of bending, and fitting to get it right. Once I got the contour the way I wanted it. I sprayed it with Plastic-Dip.
Note: This is for the Nismo bumper only.