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The serrated/helix design of the Silver Bullet Throttle Body Spacer creates air turbulence in the intake manifold. This turbulence increases the air pressure in the combustion chamber, resulting in increased performance and improved throttle response. The serrated/helix combination design also reduces intake whistle that occurs with helix-only designs. This Silver Bullet Throttle Body Spacer is precision machined from 6061-T6 billet aluminum for lighter weight, high strength, and perfect fit and finish. Its black anodized finish gives a stealthy look.