Thoughts on exhaust?

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  • Ric
    • Mar 2026
    #1

    Thoughts on exhaust?

    So the time is near to fab up some new pipes for the 300. It's been K&N podded and jetted and halfway piped already using the factory headpipes. Well they're getting rusty, so I wanna have new ones ready for it before the ones on it rust through. I'll be keeping the 17" Dime City megaphones on it. For now.

    I found a combo tube with 90? and 180? bends in it and plenty of straight length to make an entire pipe from one piece. I wanna go 1 5/8" all the way to the muffler, which is almost the max OD of the exhaust gasket. Would the bigger pipe diameter make the bike less brappy and more throaty? Or just waayyy too friggin loud?

    I'm also considering stepping up to 1 3/4" after the final bend to eliminate the need for those adapter rings.
    Tags: None
    • Steve
      GS Whisperer
      • Jun 2005
      • 35927
      • southwest oHIo
      #2
      I am not going to preach on the evil of loud exhausts, I am only going to say that I have never heard a small twin make ANY pleasant sound with anything louder than stock exhaust.

      I have no idea how brappy or throaty it might be, but I can pretty much guarantee that very few people will appreciate it.

      Now, a four-cylinder bike has a certain "note" to it, but not a loud twin.

      .
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        Comment

        • Ric
          #3
          It's pretty brappy as is. I'm thinking due to the tiny header pipe - the higher velocity makes more of a snappy note. That's why I'm going with bigger pipe, to try and knock down that snap... it actually sounds pretty freaking wicked other than that.

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            • Guest
              #4
              I'm less concerned with noise than Steve is, but I think you would be better off making the header and mid pipe to suit the engine specifications and then use the muffler canister size/style to get the sound you want. Have a look at this exhaust calculator to get yourself into the correct ballpark for what your engine wants for correct performance: http://www.timeinthegarage.com/exhaust-calculator/


              Mark

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                • Ric
                  #5
                  Thanks for that link! I need to dig up cam specs, now.

                    Comment

                    • Guest
                      #6
                      Originally posted by Ric
                      Thanks for that link! I need to dig up cam specs, now.
                      Mine are given in the service manual. If you don't have one, download it from here: http://members.dslextreme.com/users/bikecliff/


                      Mark

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