aFe 46-35002 Silver Bullet Throttle Body SpaceraFe 46 35002 Silver Bullet Throttle Body Spacer Silver Bullet throttle body spacer is constructed from precision machined 6061 T6 billet aluminum and is designed using a serrated helix design that creates turbulence in air flow at the point just prior entry into the engine. This turbulence helps the air fuel charge burn completely providing increased horsepower, torque and improved throttle response. Serrated Helix Design: The Serrated Helix