aFe Silver Bullet Throttle Body Spacers TBS 2014 GM Silverado/Sierra 1500 V8 5.3Lhe 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 the air flow at the point just prior entry into the engine optimizing the combustion cycle. This turbulence helps the air fuel charge burn completely providing increased horsepower, torque and improved throttle response. During testing, Silver Bullet throttle body spacers have