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Very nicely laid out...great photos...

I have one question, though...can you guys describe to me as best as possible how this sounds when you are done?

The reason I ask is, I don't want my bike sounding like a Milwaukee Paint Shaker (HD) and then when I open the throttle, sounding so loud it wakes the entire neighborhood up.

I wouldn't mind it sounding throatier, but want to avoid it sounding like a really loud and obnoxious HD.

Thanks

Chip
I didn't drill the eight 1/2" holes in the end plate, but did remove the baffles. It's a little louder than stock, but not by much. After riding it today, I would bet that it would still be within the noise standards...

Smitty
 

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Thanks for the awesome pics Dewman, and taking the time to share this. I had found a website which had Roadburner Street Pros for $202.00 sale price. Ordered them on Thanksgiving, waiting to see if they have them in stock,etc...price was fantastic. If this does not work out I definitely will try out the mod....you make it look easy!
 

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Done this mod today. Sounds a little better i'm thinking about doing the 8 1/2 in the end cab. somone said they took out the end cab. Does any one have a picture of this. Also i got the 1st baffle out of each exahust the 2nd one fell in there somewhere and can't find it. or reach it with me long magnet. but i dont hear them rattling so hopefully they stay that way.....
 

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Hello everyone,

I just bought my m109r last night (2007 w/1200 miles on it). I already love it already, and want to give it the sound it deserves. I've looked at the post and still have two questions, it would be great to get some help.

1. After debaffling, was there any lost power or performance differences at all?

2. I am still not completely clear on the 8 1/2 holes. Am I over thinking it? Should I just drill 8 1/2 holes evenly spaced through the first metal wall?

Thanks,
Michael
 

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Hello everyone,

I just bought my m109r last night (2007 w/1200 miles on it). I already love it already, and want to give it the sound it deserves. I've looked at the post and still have two questions, it would be great to get some help.

1. After debaffling, was there any lost power or performance differences at all?

2. I am still not completely clear on the 8 1/2 holes. Am I over thinking it? Should I just drill 8 1/2 holes evenly spaced through the first metal wall?

Thanks,
Michael
1) you wont notice any power or performance differences. your fuel mileage may go down but thats just because you will be twisting the throttle more.
2) the 8 holes should be evenly spaced and 1/2 inch in diameter. you can do them smaller if you want.
you will probably want to get some high heat spray paint (black) to prevent rust after you drill the 8 holes. you wont be disappointed with the sound. its not too loud but just loud enough to hear it!!
and yes. you are overthinking it!!
 

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Hello everyone,

I just bought my m109r last night (2007 w/1200 miles on it). I already love it already, and want to give it the sound it deserves. I've looked at the post and still have two questions, it would be great to get some help.

1. After debaffling, was there any lost power or performance differences at all?

2. I am still not completely clear on the 8 1/2 holes. Am I over thinking it? Should I just drill 8 1/2 holes evenly spaced through the first metal wall?

Thanks,
Michael
http://www.m109riders.com/forums/showthread.php?t=117323&highlight=debaffle

Check out this thread and look at the 8th post down pictures. Just drill it man!
 

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Ok, thought I would do this to help everyone out, not sure if it does or not.

First, how my bike sounds stock.

Next, this is with both baffles out of both pipes, and no 1/2 holes yet.

This one is with 2 of the 1/2 inch holes.

I liked the sound, but wanted more umph. I drilled two 1/2" holes. I will record tonight and get it up as well.

However, my next move is to go to 4 holes. When I do this, I will record and put up as well.

Thanks,
Michael

Also, as to my experience... It also took me longer to get the correct tools than to do the job. If you take it slow when removing the hole cutter you should be able to get all of the baffles out. I had to use the magnet on both pipes for the second baffle, but they were very easy to get.

Drilling the 1/2 holes was a bit different. Each hole take a bit longer than you would imagine, and you have to be patient and just take your time. I think I will use a center punch next time to help keep a better position on where I am drilling.
 

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OK,
I finally got around to drilling out the baffles. The photos, and directions were great. My only question is, what should I see now when I look inside of the pipe? It almost looks like there is another set of baffles. I took 2 out of each pipe, like in the photos, but I still see something:dontknow:.
 

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Just got off the phone with some local experts and found out that there is a slight difference in the 06 and some 07 exhaust. The first 2 baffles can be reached with a 12" extension, but there is one more a little futher in. It "can not" be reached with a 12" extension, and will need at least 18" to get to it. Once it warms up, I will see how it sounds with the inner baffle still in place. If it is not to my liking, I will give it a try with a longer extension:bigthumbsup:.
 

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excellent write up and great pictures.

I plan on doing this as well and posting results of the following sounds all in one video:

Stock
1 baffle removed from each pipe
2 baffles removed from each pipe
4 holes drilled with both baffles removed from each pipe
8 holes drilled with both baffles removed from each pipe

I think this would give a comprehensive review of what the difference is in sound between each change. And to ensure that all other variables remain the same, the camera should not be moved from its position relative to the bike, as well as changing the RPMs from idle to 3k......

Should be interesting.....
 

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excellent write up and great pictures.

And to ensure that all other variables remain the same, the camera should not be moved from its position relative to the bike, as well as changing the RPMs from idle to 3k......

Should be interesting.....
Thought I was doing about the same in my video's :).

*I do with I would have done some slower rev's as well, and slow rev to about 3k and hold for about 5 seconds.

Michael
 

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Thought I was doing about the same in my video's :).

*I do with I would have done some slower rev's as well, and slow rev to about 3k and hold for about 5 seconds.

Michael
I guess I mean, combine it all into one video.
I really liked the sound of the second video, there was a noticeable difference. I think if it was back to back with no interruption of having to start another video it would be a more dramatic difference. I think with the subtle changes of just one baffle removal at a time, this difference may be small enough that it would be hard to tell......

Slower revs to about 3k, I agree. I'll make a point of doing that to so that people can get an idea of what it sounds like as they are cruising down the road........

again, I really like the sound of the de-baffled pipes, very nice.
 

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I had posted this in the other thread but I will post it here too. It might help someone to see just what they are drilling through.

Some have comented on the tone getting much deeper once the third baffle is cut out. Here are some pictures out of a 2006 that may explain why.

1st baffle shown(with eight hole mod but no center hole cutt out) from the inside looking past the 2nd baffle(or middle one)


2nd or middle baffle (not much there)


Here is where most of the work is done 3rd baffle (closest to the engine)
 

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Just got off the phone with some local experts and found out that there is a slight difference in the 06 and some 07 exhaust. The first 2 baffles can be reached with a 12" extension, but there is one more a little futher in. It "can not" be reached with a 12" extension, and will need at least 18" to get to it. Once it warms up, I will see how it sounds with the inner baffle still in place. If it is not to my liking, I will give it a try with a longer extension:bigthumbsup:.
I've looked everywhere for a 18" extension and can't find one. Is it safe to hook a 12" and a 6" extension together?

Anyone close to Music City already have the tools and be willing to help a 9r out?
 

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Discussion Starter · #36 ·
excellent write up and great pictures.

I plan on doing this as well and posting results of the following sounds all in one video:

Stock
1 baffle removed from each pipe
2 baffles removed from each pipe
4 holes drilled with both baffles removed from each pipe
8 holes drilled with both baffles removed from each pipe

I think this would give a comprehensive review of what the difference is in sound between each change. And to ensure that all other variables remain the same, the camera should not be moved from its position relative to the bike, as well as changing the RPMs from idle to 3k......

Should be interesting.....
That should be quite interesting. I didn't think to do that stuff when I put up the pics but something you might also think of is seeing if you can get a hold of a decimeter somewhere. I was looking for some and you can get them pretty cheap, would be interesting to see what the difference in decibel output is.
 

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I guess I mean, combine it all into one video.
I really liked the sound of the second video, there was a noticeable difference. I think if it was back to back with no interruption of having to start another video it would be a more dramatic difference. I think with the subtle changes of just one baffle removal at a time, this difference may be small enough that it would be hard to tell......

Slower revs to about 3k, I agree. I'll make a point of doing that to so that people can get an idea of what it sounds like as they are cruising down the road........

again, I really like the sound of the de-baffled pipes, very nice.
Yeah, I think that will be helpful, plus if you use a better camera than an iPhone you will be doing better than I.

Until that video comes, what I found helpful was to play all three videos one at a time until you get to the section where I am reving. Then Pause each one.

Once there, then you can start one video, listen to a rev, pause, do the same with the next. Very nice comparison.

So, I am off to brave the freezing temps here in FL, a High of 45. And make more holes and then video.

Now where are those thermal underwear?

Michael
 

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That should be quite interesting. I didn't think to do that stuff when I put up the pics but something you might also think of is seeing if you can get a hold of a decimeter somewhere. I was looking for some and you can get them pretty cheap, would be interesting to see what the difference in decibel output is.
I have some recording equipment that plugs into my laptop for musical purposes. I'll use that equipment instead of the mic on my camera. This should be very interesting.
 

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Which bike may have 3 baffles per pipe?

I have a 2007, and looked down my tail pipe (haha) and it sure does look like another baffle is down there.

Thanks,
Michael
 
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