Exhaust Bypass Valve


I just discovered your website and I enjoyed reading everyone’s questions and it seemed your answers were very helpful to them.

My question: Land and Sea used to have an exhaust bypass valve (dump valve) but they discontinued it.  It attached to your speedometer hose and when you exceeded 50mph a valve would open and your exhaust would exit the motor above the water.  They did not have any information on who else might make a similar product.  Just wondering if you could help!

Or, are there any modifications that I could make to my motor to open up the exhaust a little bit (don't mind cutting or drilling)?  The motor is a 1991 Evinrude XP 200hp V6. 

Thanks for any help or advice you might be able to give!!



Aside from making noise, you will not see any performance gain that you can measure. You may see a performance drop as a matter of fact. Leave it alone and work on the setup. You will be better served and the neighbors will like you for it. 




Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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