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  1. K

    Puzzling issue in gas mileage improvement

    OK, so I need to bring this one to the forum. I keep somewhat fanatical records on my vehicles. 69,450 miles ago there was a front end alignment done and the toe-in was set to +3/16" on the front end. My truck is a Toyota 4x4 which sees frequent off-road trips. Just over 1k miles ago I found...
  2. K

    Exhaust Header design in 4-2-1

    In exhaust tuning it is well established that a 4-1 header provides the greatest Hp but only at peak rpm. For a more street efficient system a 4-2-1 give more gain at low rpm and moderates the peaks. Conventional design criteria says to tune the primary tubes to reinforce the rpm you want...