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4-TEK

The following products are designed for use with your Sea-Doo Jet Boat or boat equipped with a Sea-Doo 4-TEK engine

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If you still have questions, feel free to contact me at jeff@cobrajetsteering.com

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Testimonials
  • Testimonial for the Mercury Optimax system:

    Thanks much. Your invention saved my relationship! (with my new/used jet boat). During 15 years of owning two I/O's, I was careful (and ...

    email to CJS

  • 2017 212 Ltd S with Articulating Keel

    I emailed Jeff ahead of ordering and he quickly answered all my questions. Several emails were exchanged and I got all the answers. I order the...

    Allen Franke

  • My personal views/review of the Cobra Venom Magnum AK with MEGA Fangs:

    When I got my boat this spring, it was my first jet boat. But, I have been boating as long as memory serves a...

    Jameson Clark

  • I received the cobra viper yesterday and installed them last night after we got home from the lake on my AR195. Took off my thrust vectors and installed your product in about 30 minutes. Headed back...

    via email to CJS

  • Customer review of ultimate ak and mega fang plus on a 21 foot Yamaha as opposed to thrust vectors. First off, install was easy. I had no trouble following instructions and the pictures provided. ...

    email to CJS

  • Customer review sent to me on the new Ultimate A K steering with mega fang plus compared to the thrust vector steering on a 21 foot yamaha the articulating kee...

    email to CJS

  • I don't know how you figured out how to do this .But what a difference it made on my gsx.I enjoyed this ski accept for the loss of control at high speed . If I turned fast it would loose its bite and ...

    Bill

  • Been meaning to chime in and tell you guys how awesome the Viper unit is. I now have 2 seasons with the 16 192 and wifey has only driven once for literally minutes. She just keep saying I can't keep t...

    via post on a jet boat forum

  • Fins are working great! Wow, what a difference. Install went smoothly. I would recommend the fins to any jet boat owner! Thanks Jeff!

    Derek Dial

  • Jeff, Had to write you and let you know the results on how my 232 Yamaha handles with the installation of your Cobra Jet Ultimate fins. Let me first start by saying that this boats future was in jeopa...

    Doug Salve

  • All I can say is wow! My wife and I purchased a 2000 seadoo challenger in March. Docking was a nightmare, I was absoulutly scared to death to pull into the launch ramp sometimes even jumping out of th...

    Aaron in Ohio

  • i found Jeff's website through a search for upgrades and read the page, then i called Jeff and had a nice conversation relating to the product. i then purchased a unit and have recently operated my sk...

    Jim

  • It's hard to believe that such a small incremental expense can drastically change the overall performance of the entire experience. I am not a professional rider, in fact this is my first ski. I had i...

    Brad Buchmann

  • I too had a miserable time docking or re-trailering my 21 foot twin jet boat without the cobra system. Jeff shipped me a set quickly and now its like night and day at slow or fast speeds. I would reco...

    Dave Richardson

  • I can't say how much I enjoy your product ,excellent all around slow, fast, docking or pulling, just great engineering and fabricating thank you so much!

    Timothy O'Brien

  • Jeff, Took the Vortex Vrx 223 out yesterday with the cobra fins on.. it makes a big difference. we hit 50MPH in rough water on lake tahoe yesterday.. You should sell your patent to the boat ...

    James via email to CJS

  • I need to share my recent experience with you and visitors to your web site. As you know I have had your steering system on my sea doo for nearly as long as I have had it, about two years. My girlfrie...

    David

  • After lots of research and reading on this website I decided to put Cobra Venom steering fins on my 2012 242LS. I wouldn't say I'm an "experienced" boater. I did own an entry level Regal bow...

    via email to CJS

  • I purchased the SeaDoo Jetboat primarily because the waters here in Bradenton are so shallow. Jeff put on the steering mod and the handling is so much better. It has maneuverability at idle whereas be...

    David Cooper

  • I am the individual who allowed my 2004 sea doo to be photographed and displayed on this web site. I consider myself to be a serious jet skier and have been for nine years. After purchasing my newest ...

    Ed

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