PowerLab VQ35DE 3/8" Billet Intake Manifold Plenum Spacer is designed and produced here at the lab with our in-house CNC Mill from billet aluminum. The results of extensive research and development at PowerLab have concluded that our Plenum Spacer provides increased throttle response, peak horsepower and torque gains, lower intake temperatures, and increased volumetric air flow to all cylinders.