aFe 46-32004 Silver Bullet Throttle Body SpaceraFe 46 32004 Silver Bullet Throttle Body Spacer Serrated Helix Design: The serrated helix design (US PAT 07055513) creates turbulence in the intake manifold and increases air pressure in the combustion chamber for better performance. This unique entry design also reduces intake whistle that commonly occurs with other helix only styles. Longer Intake Tract: The addition of a Silver Bullet throttle body spacer lengthens the intake tract, which increases