| Author | Message | ||
     Rwcfrank |
Not wanting to start a muffler war here I am thinking up increasing the "sound" ever so slightly. The Buell diagram online of the internals of the mufflers seem to differ from my 08 in the area of the outlet. It looks like some of the mufflers have a dual walled outlet yet mine is clearly a single walled outlet with a slight turn out. I plan to cut the outlet off flush with the can and add a 2 inch to 2 3/4 slash cut stepped outlet. Since back pressure will not change the larger outlet may increase the sound slightly. I dont want to get flamed here, I agree quiet is the way to go but this should only change the tone slightly and it will help keep my rear wheel, swingarm and caliper clean. | ||
| Etennuly |
I have added an outlet to the right side of mine in the rear compartment. I welded on about a six inch tailpipe to keep the heat away from the belt. It sounds a lot like my City-X did with the Buell Race Pipe. It is a nice rumble sound that when at sixty mph is overcome by wind noise. I did it as a test for heat relief and really like the sound, so it stayed. | ||
| Gunut75 |
The only difference in the XB12 mufflers is that the Ulysses mufflers had an extended exit pipe to clear the longer kickstand. The dual walled part you speak of is nothing but a trim flange that is nice and shiny welded to the outside of the pipe. Cheers. | ||
| Froggy |
Half way into the 2007 model year they changed the muffler removing the cheese grater thing on the exhaust tip, but that was it. The muffler is functionally identical, just the slight cosmetic difference. | ||
| Rwcfrank |
Thanks gentlemen, I will begin hacking and welding soon. Etenully how did your mod affect performance? (Message edited by rwcfrank on July 25, 2011) (Message edited by rwcfrank on July 25, 2011) | ||
| Etennuly |
Thanks gentlemen, I will begin hacking and welding soon. Etenully how did your mod affect performance? I would say nearly none unless you want to go into how the bike runs more aggressively when run hard because of the ECM curve. But it sounds sweet! I will see if I can find pictures. | ||
| Etennuly |
I just cut a hole in the right rear compartment and added a pipe.    | ||
| Rwcfrank |
I thought about doing exactly that but I was going to use a hole saw to drill into the internal outlet tube effectively leaving the secondary chamber the same functionally and adding the "Y" to the outlet tube. | ||
| Rwcfrank |
In the diagram you can see the looped end of the exit tube. I would like to tap into this rather than the chamber. Thoughts?  | ||
| Andymnelson |
That would give you stock sound with 2 outlets, if that's what you're going for. | ||
| Johnboy777 |
Here are the drawings I made after I opened up a sacrificial XB12 Muffler to mod it.   Opening up the muffler with another outlet would pretty much give you the same result as wiring your muffler open. The muffler runs with valve normally closed - that is also the default setting, if actuator fails The spring closes the valve - the actuator opens it. ... (Message edited by johnboy777 on July 25, 2011) | ||
| Rwcfrank |
Johnboy, I agree with you completely. I think tapping into the exit tube inside the muffler near the outlet making a "Y" exit should not impact the chamber and it will still allow the valve to work. Again, I am only trying to increase the rumble a little bit and do not want to harm performance. There is no way to tell what it will sound like until it's done unfortunately. | ||
| Bikelit |
Rwcfrank - I have modified a few Buell mufflers and have a stock Uly muffler and other parts left over. I'm in Sunnyvale and work in Palo Alto. Let me know if I can help. - Mark. | ||
| Rwcfrank |
Thanks Mark, I plan to start with the left side stepped outlet 2" to 2 3/4" first and go from there. How were your results from the mods you did? | ||
| Bikelit |
Most, if not all stock muffler mods will drop performance. Buell engineers knew what they doing with the stock pipe. I was not a fan of cutting open the rear without other changes. The bike ran OK, but sounded like a muffler with a hole in it. Best results were with replacing the stock internal pipes with perforated pipe and stainless mesh. The sound is great and more "cop friendly", which is important here in the city. There are a few different ways I tried it, including a single pass out to exit. I would also avoid gutting it. | ||
| Etennuly |
The pipe I put on there was initially done to release heat from the muffler under a different set of circumstances. I wanted to get some heat and restriction out of the main part of the can while not allowing it to get too loud. My plan was to cut it back off if it was too loud. I like stock pipes all around. But the sound of this thing is just sweet. V-twin thump, no droaning on long trips, and quite quiet when not loading the throttle, so I can still sneak out of town. The parts were finish cut and ground to fit and the tail pipe tip was cut at a nice angle not shown in the pictures. Over all no one even notices the pipe on the right side save for Buell owners. I tucked it up close to the bottom of the belt guard's lower travel limit, and out of the way of feet and legs. There has been no detriment of tune. The bike runs as well with it as not, and did not require any retuning or mapping. It is a minor controlled exhaust leak with a nice sound. Which is also part of the reason I chose a smaller pipe diameter. So you know, unless you run really short stubs, the left and right pipe will have to be different to clear and not damage the surrounding items and or your legs when stopped. There is no need to over complicate this modification.  What I did was simple and can easily be reversed if you don't like it. I did not even have to remove the can to do it, I just un hooked the battery and used some aluminum flashing for deflector shielding when I welded it. Actually for what you want to do I highly recommend it be done in a similar fashion. This only took about a half hour total to do. My exhaust modification has been on there about two years now with no issues in running or being too loud. I did however manage to flatten about a quarter of an inch of the tip when I dragged the right peg on the Snake last year. Did I mention it sounds sweet?  | ||
| Rwcfrank |
That sounds like what I am looking for, what diameter pipe did you use? | ||
| Etennuly |
The pipe is 1 1/2" that has a little flare to 1 3/4 after the curve where it is welded to the can. I doubt the flair is necessary, but this pipe was pre-formed as a gas filler neck for a van. It worked great.  |
