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I have read and can believe this should add 5-7 RWHP for a ztube (on a g35 alone).
Add to that a true K&N filter that comes with the stillen air box it just helps the engine breath better.
We live in the mountains at 7000+ ft. I can only imagine the gains you could see in a RWD at near sea level.
Here is the stillen intake and z tube ready to go, with all of the tools you will need.

edit by particlefx: added the PDF version