gmtech Custom Fishing Rod Holding Tubes...

[Ronnie]

@zipper , thanks. I took a longer look at GM's pics and quickly realized you are correct and that this mod will have to wait until next year, if ever. Still, I will get under there to check the clamps and take some pics in prepping and planning for the mod.
All these years on this site and YJB and this is the first time I recall anyone putting mufflers in to reduce engine noise, awesome @gmtech16450yz ! Why hasn't anyone done this before? I remember the extreme mod (IMHO) being the addition of an alternator for a Yamaha with a stereo that had a very high power needs with multiple and batteries. Not may members did this mod either, maybe only one.

 

[Sbrown]

first time I recall anyone putting mufflers in to reduce engine noise

You have to realize, he put the mufflers in after he opened his exhaust outlets up for more power and then decided he didnt like the way it sounded, so he installed the mufflers as a sort of remedy. At least thats how it read to me.

 

[swatski]

You have to realize, he put the mufflers in after he opened his exhaust outlets up for more power and then decided he didnt like the way it sounded, so he installed the mufflers as a sort of remedy. At least thats how it read to me.

Well, I believe the "resonators" (black plastic boxes, not the water boxes) make a big difference in the exhaust setup noise levels, and I believe @gmtech16450yz put his resonators back in.
The outlet itself is probably much less of an issue - for soundproofing, but the OEM exhaust outlet assembly is so bad, it quickly looses the sealant ring (AKA Yamaha jet boat hymen, lol) and leaks water into the bilge - in most boats.

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[Scottie]

Someone help me picture the exhaust routing here. In the pic below, the muffler we see is coming from the port side resonator, connecting to the starboard water box, right? Where is the other muffler and how does it get over to the port side water box?

 

[zipper]

Someone help me picture the exhaust routing here. In the pic below, the muffler we see is coming from the port side resonator, connecting to the starboard water box, right? Where is the other muffler and how does it get over to the port side water box?
View attachment 78785

This is a great pic. However go down about 4 more pics. and you will see that the other muffler is hidden under the forward edge of the "clean out port compartment". Link, https://jetboaters.net/threads/gmtech-custom-fishing-rod-holding-tubes.16169/page-2 post 29.

 

[Scottie]

Ah ha! I see now. I saw that pic, but I was thinking it was the same muffler as the first pic, but just a different angle. I was wrong obviously. So one muffler across the back and one across the front, and you don't have to change the exit routimg at all. The exhaust side "swap" is from running the exhaust to the opposite water box.

 

[zipper]

@Scottie He does swap sides, port engine exhausts out starboard exhaust port which was also customized. And visa versa, starboard engine exhausts out port exhaust port.

 

[jacoviii]

Yes.

Would you say the mufflers were worth the cost of parts. I have everything sitting in my cart just needing a yes or no before I pull the trigger.