Throttle Body Spacer

Discussion in 'Performance & Fuel' started by tblazer05, Mar 12, 2009.

  1. tblazer05

    tblazer05 New Member

    I have a 2005 Trailblazer 4.2L. I want to know if I should buy a throttle body spacer or get a ported throttle body. What kind of difference will this make in my hp and gas millage?
  2. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Tried t/body spacer on wifes 05 4.2 Trailblazer and saw no improvement on dyno. Removed and installed AFE cold ait intake and saw 12hp at rear wheels. Never tried ported throttle body on 4.2, but I dont think the motor needs one. It may kill some of your bottom end torque.

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