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  1. #1
    IDoSeaDoo's Avatar
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    Custom 4tec boat - resonator question

    Hey guys, I'm building a custom Challenger and using the 2008 style resonator to silence the 4tec. I'm making a completely custom mount and was wondering two things:

    1. are there any negative effects of running this thing in reverse?

    2. should I tip the expansion chamber up a little on the axis of the exhaust flow, or leave it horizontal? There is a flat part and if I don't tip it up, it'll get water in there, especially on turns.

    I'm most concerned with #2. Does the function of this resonator depend on it being flat with some water in there, or should it be tipped up so as to not fill it and choke the exhaust? I only found one video of it on youtube and it seemed that it was in there flat, but I'd like to be more sure.
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  2. #2
    boost junkie skidoochris's Avatar
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    just leave it out, its useless
    unless its the water box (muffler)
    pwcs have a muffler and a resonator

  3. #3
    IDoSeaDoo's Avatar
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    I'd rather not. There are times when I want this boat as quiet as possible, and I've tested it with and without a resonator. It made quite a difference.

    Can someone look on their ski and tell me if that expansion chamber is lifted up some, or is the base horizontal?
    Thanks!

  4. #4
    connorrxp's Avatar
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    Just pulled mine out of my px, the resonator chamber is lifted up some but its only because it has to follow the angle of the hull, it is parallel to the angle of the hull. At least that's what I think you're asking. When I chopped it out of my old PX there was water inside it, so it does fill with water but you won't choke out your motor if you lay it horizontal given what it looks like on the inside of the resonator.

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  6. #5
    IDoSeaDoo's Avatar
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    Quote Originally Posted by connorrxp View Post
    Just pulled mine out of my px, the resonator chamber is lifted up some but its only because it has to follow the angle of the hull, it is parallel to the angle of the hull. At least that's what I think you're asking. When I chopped it out of my old PX there was water inside it, so it does fill with water but you won't choke out your motor if you lay it horizontal given what it looks like on the inside of the resonator.
    Thanks, that's what I needed to know. Anyone flare their j pipe and notice a difference? I know guys that did, but they did other mods too. I want to do it, but want to see how it does both before and after.

  7. #6
    boost junkie skidoochris's Avatar
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    best exhaust mod is to scrap the J and use the 08+ mid pipe/can

  8. #7
    IDoSeaDoo's Avatar
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    I actually invested the money, and tried to install the newer exhaust system. Unfortunately, my boat is rather limited on space for the exhaust pipe. No 4-tec exhaust system will fit in this boat without significant modification. I had to shorten the original water box by some 4 inches or so. The jpipe allows me to twist the water box therefore giving me more room to install it. Because of the design of the new exhaust manifold, I cannot rotate the water box as much and therefore I would have to shorten it even more. I don't know how this would affect the system's performance, and noise levels. Instead of cutting the system up and experimenting with it, I would rather use the mounts that I already have in place for the old exhaust and just sell the new system.

  9. #8
    IDoSeaDoo's Avatar
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    Hey, one more question: What were the reasons for the waterbox cover? That rubber/foam capsule they had around the waterbox? Is it worth to keep that thing on? Does it help deaden the sound, or just help insulate the engine bay or both?

  10. #9
    boost junkie skidoochris's Avatar
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    all the above and to keep it from chewing up the fiberglass hull
    brp does not cover the waterbox on the newer skis

  11. #10
    IDoSeaDoo's Avatar
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    Quote Originally Posted by skidoochris View Post
    all the above and to keep it from chewing up the fiberglass hull
    brp does not cover the waterbox on the newer skis
    Is it worth the extra 10 lbs to keep it?

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