Modifying stock muffler?

[Skyboy8950]

Just to shoot a question out there...

Is it possible to modify a stock muffler so that it is A: louder, and B: improves performance? I kinda just wonder what is inside those puppies and if I can tear that stuff out.

Just an idea...

[salty_monk]

I've heard of people drilling stock pipes to make them louder... not sure it will increase performance though.

Dan

[t3rmin]

If you modified them to the point where they had the potential to increase performance you'd most likely be looking at a rejet. And you'd probably want to install pod filters to get 'er breathing on the intake as well.

[Tarbash 27]

Sell the stock exhaust to someone who is looking for one and buy an aftermarket exhaust. Dont hack them up, you'll regret it.

[spchips]

1) Take a piece of 3/4"(?) pipe or rod

2) Stick it down the tailpipe

3) Beat it with a hammer

Viola, now you have a machine that is slightly louder than stock. I don't think it helps performance, but apparently this was very popular back in the day.

[Commodus]

Yeah you can definitely punch out the pipes. It definitely makes them louder, and you may have to rejet slightly.

I wouldn't do it myself. If you want it to be louder, buy/adapt a real performance pipe. If the price of such an endeavour scares you off, I would suggest leaving the bike stock.

But it's your bike!

[planebuilder]

Rejet?

This thread brings a question to mind. I have a Yomama haul (750) that I wanted more music outa the pipes so I drilled three 3/4" holes into the backplate of each exhaust. Sounds much better and was cheap! I'd like to drill three more now in between the three I drilled. You know, if some is good then more is better, right?! I haven't done so because I'm wondering if I'm going to get myself to a place where I will really need to rejet. And if so, what rejetting would we be talking about? In other words are we talking about drilling out jets or replacing and what would be a logical choice of size (I can hear someone out there asking why I want to talk logic when I just went and drilled holes in my exhaust) Any thoughts?

Thanks in advance,

Planebuilder