What is the best intake kit for G35 coupe?

I'm just looking at these JWT Pop Charger and Stillen Intake kit both with Z-tube.

but my friend keeps telling me that keeping my stock intake is the better way for the car's

performance which means that having JWT or Stillen intake sometimes lowers the

performance. is this true? then they just give you a better sound not better performance?

 

swapping out intake really doesnt give you any performance unless you throw a vortech supercharger.

The way to go is get 5/16 MREV Plenum spacer.

 

For sound & construction Stillens CAI is impossible to beat with it's giant K&N filter. With the pop charger you could easily lose 20+ hp during hot weather caused by heat soak. The Stillen intake comes with a CARB sticker so you'll always be legal.
Gary