Kawasaki 440 / 550 XL Hull Extensions

(4 customer reviews)


Kawasaki 440/550 XL Hull Extensions lengths the hull by 1 1/4 inches to increase nose stability and reduce porpoising. These perform best on engine swaps, heavier riders, and anyone looking for more nose control. Comes with extensions and hardware.


This product does not come with silicone. Purchase our approved silicone.


Installation section

  • This product fits: Kawasaki 440 / 550 (all years)
  • Installation time: 1-2 hours, let silicone cure for 24 hours
  • Kit Includes: XL hull extensions, instructions, and mounting screws

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Frequently Asked Questions

  • How do these XL hull extensions compare to the originals?
    The XL Hull Extensions are 1 to 1 1/4 inches longer than the original extensions for increase nose pressure. This pressure is ideal for engine swapped 550’s, heavier riders, and anyone looking for more nose control, ie. less bouncing.
  • Do you have an option for no exhaust hole?
    No, the exhaust hole is part of the extension shape. If you do not have rear exhaust, still seal the inside hole using silicone.
  • Do you offer these in another color?
    No, our material only comes in black but you can paint them just like any automotive rubber/plastic part. We strongly recommend keeping the bottom and side surface matte for predictable performance if you decide to paint them.
  • Is this part legal to race with?
    You will need to check the rules from your racing organization to verify if this part is legal for competition. ProWatercraft takes no responsibility if you are disqualified from this part breaking any racing organization rules.

Additional information

Weight 3.5 lbs
Dimensions 7 × 6 × 6 in

4 reviews for Kawasaki 440 / 550 XL Hull Extensions

  1. Kevin L

    Right off the bat I noticed the ski likes to stay planted. Under hard acceleration it keeps the pump hooked up. Almost eliminated the annoying 550 purpose… The grip while cornering is a huge improvement!
    When popping off a wake (think jumping a boat wake) the ski tends to want to level out instead of going nose high. I did notice the handlebars do have a slightly stiffer steering feel back and forth.

  2. Brayden J

    …I can definitely feel a difference. it hooked well in the corners and i have the whole handling performance set up with it. On straight aways it really kept the front end down more and eliminated the usual slap that 440/550s have. I was happy with how it handled especially with that 750 motor and the 750 pump matched with the extensions, it made it pretty nice and smooth in corners and straight aways. Seems as if 750 swaps cause for the ski to be heavier in the nose and it still did awesome.

  3. BT

    The XL extensions are a huge improvement over stock. The biggest improvement was felt in a straight line. The nose of the ski is definitely planted more and porpoising greatly reduced.

  4. Jeremy G

    XL hull extensions make a world of difference on this ski. I love them

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