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throttle body spacers

  1. Throttle Body Spacers!! FACT or FICTION!?

    Tuning & Calibration
    Well, I have been looking into either purchasing or having my machine shop making a Throttle Body Spacer for my 99' Cougar 2.5L. Then, I have a couple of questions, I have seen manufactures boast anywhere from 5hp to 25hp gains depending on the engine. Well, that SEEMS a little too much for...