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Thread: Fatshot vs. Kerker

  1. #11
    baggermanmcp Guest

    Default 2007 103" x 255 cams

    So, on an 07' w/255 cams running 10 discs should be the "sweet spot" for performance and sound with the Super Trapp Fat Shots closed cap?

    Can you give me an idea on what I get, if I purchase a set of open end caps, as far as increase in volume? I used to run the 128-78020 but decided to move to the fat shots for a bit less volume and more flexibility.

    Thanks for this great insider forum. Your tech. support is greatly appreciated!

  2. #12
    bschultz Guest

    Default

    You will gain volume (a couple db's) approaching the Kerkers, P/N 128-78020; however a deeper sound.

  3. #13
    Gary D Guest

    Default

    If I'm right, A HD fat shotz muffler with an open end cap and 10 discs will flow the same as a closed end cap and 20 discs? So if I put that fat shotz muffler on my -09- Road Glide, it would be the same as a closed end cap with 20 discs. Would it be too free flowing? I'm asking because you recommend 10 to 12 discs and a closed end cap as a starting point if I mounted supertrapp fatshots. I'm guessing a HD fat shotz muffler with an open end cap is flowing the same as a supertrapp muffler with 20 discs and a closed end cap. Please shed some light.
    Thanks
    Gary D.

  4. #14
    bschultz Guest

    Default

    You are correct; however keep in mind the HD FatShotZ were introduced for the 2010 models to provide maximum flow/sound with a catalyst equipped headpipe.
    Our testing and feedback from tuners with a mildly modified pre-2010 touring models, equipped with an OEM headpipe, found the best performance with no more than 12-14 discs (w/closed end-cap).

  5. #15
    Gary D Guest

    Default

    So putting screamin eagle Fat Shotz mufflers with its open end cap and 10 discs might not be the optimum set up for a stock 09 HD touring model?
    Gary D.

  6. #16
    bschultz Guest

    Default

    That's correct.

  7. #17
    Gary D Guest

    Default

    With those pipes (screamin eagle fat shotz) on a stock 09 HD touring model, what would be the best set up?
    Thanks
    Gary D

  8. #18
    Gary D Guest

    Default

    TTT
    Thanks again
    Gary D.

  9. #19
    bschultz Guest

    Default

    On an '09 non-California model (no cat), stock (no mods), we found performend best with 8-10 discs and the closed end-cap.

  10. #20
    gkriske Guest

    Red face '08 FLH with SE Fatshotz

    Reading this makes me wonder if I've done the right thing with my 2008 Ultraclassic.

    I've got a SE aircleaner and SERT with the HD Fatshotz. Stock other than these.

    Had my bike dyno tuned and gained about 6 hp and 6 ft/lb torque.

    The mufflers have a nice low rumble, just a bit louder than I expected. Not too bad, but leads me to ask:

    - should I have gone with a closed end instead?
    - if I put a cap on them, do I need to have it re-tuned?

    Rather new to all of this, appreciate your help!

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