aFe Silver Bullet Throttle Body Spacer 03-06 Nissan 350Z V6 3.5L (VQ35DE)One of the easiest additions to improve low end horsepower and torque to your VQ35 is the Silver Bullet Throttle Body Spacer. The TBS has both a Serrated and Helix combination design, which creates air turbulence in the intake manifold, increasing the air pressure in the combustion chamber. This design also reduces intake whistle that occurs with other helix only designs. Serrated Helix Design: The Serrated Helix design creates air turbulence in the