Are these a stock feature or is this a modification? It's looks very cleanly done so my suspicion is that it is stock. Wanted to know b/c I would like to do a rejet and wanted to know if this was done by a PO to facilitate freer air flow and whether it needs consideration in selecting my new jet sizes. (I'm keeping the stock exhaust...for now)

The holes are not stock.

Click here for a pic of my stock exhaust.

Nope, your muffler was attacked by a drill in the middle of the night.   

Some people attack their mufflers in an attempt to make the bike louder.  I don't think it changes the jetting at all.

Quote from: GeeP on April 16, 2008, 09:44:26 PM
Some people attack their mufflers in an attempt to make the bike louder.  I don't think it changes the jetting at all.

GeeP, Crispy, thanks very much. So GeeP, the holes wouldn't make the bike run leaner than it already is? No need to consider it when rejetting?

If the holes are an attempt to make the bike sound louder, it's a pretty poor attempt. I hate to know what an adulterated can sounds like. Mine is wimpy enough thank you.

Quote from: The Buddha on January 02, 2008, 11:54:16 AM
Those holes do nothing ... not for noise, not for performance ...
Cool.
Srinath.

Found this from the thread Crispy posted below. So, no big deal I guess. At least the PO who did this did it very cleanly, as opposed to some of the other pictures of bikes I've come across that also have the 'mufflerectomy', as I've learned it's called.

Quote from: El motociclista on April 16, 2008, 10:13:48 PM

Quote from: The Buddha on January 02, 2008, 11:54:16 AM
Those holes do nothing ... not for noise, not for performance ...
Cool.
Srinath.

Found this from the thread Crispy posted below. So, no big deal I guess. At least the PO who did this did it very cleanly, as opposed to some of the other pictures of bikes I've come across that also have the 'mufflerectomy', as I've learned it's called.

Yeah, some of those "mufflerectomies" get pretty drastic. I remember one recently that was pretty much completely drilled out. I always thought they made the bike sound like a lawnmower. 

Pretty much. I rejetted and unplugged my brass hex bolt plugged mufflerectomy, shown in the thread previously linked, and it's louder, but I have a K&N lunch box now so it's not a wimpy loud, it has a little growl, and it's not super loud either, but I can hear it with my helmet on, unless I'm near a Harley, and then I can't even hear myself think! Some of them sound like someone is rattling ball bearings around inside my skull! 

I was mostly just hoping to get more air through the stocker until I can get a Yosh, but as they are chambered maybe not so much unless, I'm told, I can drill though another baffle inside. With the 'ectomy and some grunt from the K&N they sound like a nice riding mower. Stock I've read them described as sounding like a furious sewing machine.