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  1. #1

    Exhaust question???

    On a stock gp 1300 what difference will the aftermarket exhaust make with only cats removed???


  2. #2
    Hydrotherapy's Avatar
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    welcome to GH..

    what after market exhaust ???

    on stock system see below

    stock pipe with the cat removed some say will yield 5 bhp,
    main advantage is you can run fully synthetic oils plus the under seat temp is greatly reduced thus easing heat soak, plus cat has a tendency to fail and block up pipe..

    what year gpr are you refering too
    Last edited by Hydrotherapy; 02-01-2008 at 03:30 AM.

  3. #3
    i have a 2005 model.i think the dealer here in South Africa stocks Riva.my budget is a bit tight at the moment.please state in order as my budget allows me on what do start doing.the essential mods.im consdiering intake grate,machine heads,impeller,ride plates.pls advise
    Last edited by Full_Throttle; 02-01-2008 at 04:01 AM.

  4. #4
    Hydrotherapy's Avatar
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    intake grate (safety) this is a must
    tunnel reinforce..
    ppk. and seal shoe
    ride plate..you need to search to find best one for you
    stock prop good for aprox 70 mph after that a 14/20 dyna fly
    efi unit
    heads 150 psi (get stock head cut for $100)
    reeds

    other will add or adjust my list but this would be my route

  5. #5
    Thanks Hydro.Much appreciated

  6. #6
    Duke's Avatar
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    Hydro has you pointed in the right direction.

    Lose the Cat-con and get a D-plate, its cheap and the best you can do to your exhaust.

    Search around on the forum and if you have more questions on a topic bring that thread up.

  7. #7
    Thanks for the kind advise guys.

    Cats removed already and d-plate already installed.

    Hydro advised the mods that i need to do.May i ask what is tunnel reinforce and what is Reeds and purpose for these mods??.Pls forgive my ignorance as im new to jet ski mods

  8. #8
    Hydrotherapy's Avatar
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    Quote Originally Posted by Full_Throttle View Post
    Thanks for the kind advise guys.

    Cats removed already and d-plate already installed.

    Hydro advised the mods that i need to do.May i ask what is tunnel reinforce and what is Reeds and purpose for these mods??.Pls forgive my ignorance as im new to jet ski mods

    v force reeds IMO... VF'3 most run on here..

    the tunnel WILL split on a gpr letting water in your hull at any given time without notice once you start modding,its a simple job if you buy a pre made kit or get some west epoxy system if you can lay or learn to lay fiberglass..

    PM SENT

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