Horsepower increase

Discussion in '1987 - 1991 Ford F150, F250 and F350 Truck Forum' started by Curtis Castagno, Dec 31, 2023.

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  1. Curtis Castagno

    I have a 1991 F350 w/ 5.8L fuel injection
    It currently has single exhaust from the y before the catalytic converter. Most of the piping is shot. What type of system would be best to for optimal hp and fuel economy?
    Thanks
     
    Curtis Castagno, Dec 31, 2023
    #1
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  2. RP67F100

    I have always preferred a pair of good long tube headers with 2.5” pipe and good flowing mufflers, if you are in a state that requires you keep the cat, there are high flow cats available too,
    Never had one but I have read that an H pipe will balance the power, and give an increase
    It doesn’t have to be obnoxiously loud to help the power.
     
    RP67F100, Dec 31, 2023
    #2

  3. FTZ HAIC Staff Member Oregon Chapter Founding Member

    Yeah, that's about the same thing I would recommend. Short tube headers really don't gain you anything.

    I wouldn't expect huge gains, typically about 10HP and 20 ft/lbs on an exhaust setup alone, with something that's got a lot of miles on it. By the time you do the intake, new O2 sensors, etc. to gain some economy, you've spent so much that it will take a huge number of miles to gain back what you spent.
     
    FTZ HAIC, Dec 31, 2023
    #3

  4. Curtis Castagno

     
    Curtis Castagno, Jan 1, 2024
    #4

  5. Curtis Castagno

    Thanks for the information. I appreciate you both answering back.
     
    Curtis Castagno, Jan 1, 2024
    #5
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