Only thing similar to this that I have bought, was a VIAS delete plate when i got my Fujita CAI for my Nissan Altima. The VIAS delete plate helped low end torque, the air intake was mainly for the noise, though I was getting almost 30 mpg average with the VQ35. I totaled it before i could order my headers and exhaust.
I was gonna order intake manifold spacers if i ever ordered the upper intake manifold i wanted, but that was only to blow money and see if it actually was helpful.