QX70S Cold Air Intake

I would go with the Z1 Motorsports 2.5" they offer for the g37. CARB compliant as well if you are in California. All you will need to do is cut the holes in the radiator support with a drywall circular saw bit that attaches to a regular drill. Don't have to remove the front bumper, just the grille. Tune recommended but not required.
 
I went with 2.5 Z1 kit for G37, didn’t want to deal with the hassle of needed a tune with the 3 inch kit. Look for LA_driver pics on what needs to be cut out with a hole saw.
 
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