The aFe Silver Bullet throttle body spacer fits the 4.2L inline-six in the Chevrolet Trailblazer, GMC Envoy, and related GM SUVs. Its serrated/helix bore creates turbulence in the intake charge to raise combustion-chamber air pressure for stronger throttle response, while the combined pattern reduces the whistle of helix-only designs. Machined from billet aluminum with a black anodized finish, it uses the factory mounting locations and includes a gasket for a leak-free seal.
| Type | Serrated/helix throttle body spacer (aFe Silver Bullet) |
| Material | 6061-T6 billet aluminum |
| Finish | Black anodized |
| Included | Mounting gasket |
| Fitment | Chevrolet Trailblazer / GMC Envoy 4.2L I6 |
| Part Number | 46-34022 |
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