a stupid question about drilling the stock baffle

[frickin_laser]

I have done quite a few searches but I can't figure out where I would have to drill. I can't find any pictures that show that clearly. I'm not sure if older GS's (mine's a 2004 gs500f) have the same exhaust as the newer ones (the very tip that is about 2 inches in diameter and is parallel with the ground) if that makes any difference. How is it done?

[V8Pinto]

drill holes in the area in between the inner circle (exhaust outlet of your can) and the outer circle.  I used a 3/8" bit and started with four holes eventually ending up with six.

When I cut the can off to put on a supertrapp, I was shocked to find that the stock exhaust only flows through two 5/16" sized holes.  Maybe I missed something cause' I don't see how that's possible.

[Phaedrus]

Check out this link:

http://www.bikepower.net/gs500e-power/modifications/engine-related/oemexhmod/exhaust.htm

It shows a color diagram of where to drill and some information about doing it. Will it sound good?  :dunno: I hope so!  

[cozy]

Don't do it - I did it and it sounds LAME, not too mention you immediately lose some power and run leaner than the alrerady lean stock jetting. At least see if you can get a wileyco with a restrictor flange first. I hated it and rejetted/ exhaust quickly.  $.02

[oramac]

I did this mod, but I drilled the hell out of it.  I first did four holes, and it sounded weak, so I did six holes...better.  Then I widened the diameter of the six holes...better.  Then I drilled holes between the holes...better.  then I used a file and completely removed the material between the holes.  Man, I love the sound, but it is much louder than stock, but not Harley loud.  To some it may be irritating, but it definitely makes you more noticeable, and on a bike that can only be a good thing.

As far as performance changes.  I've noticed none.  I still have stock jetting and air filter, and I've had no problems whatsoever.  I have a neighbor that owns a Harley Sportster, and he actually likes the sound of my exhaust.

Oh, and a wileyco with restrictor flange is going to be over $100 right?  Any other systems will be more, and will require a rejet.  Mine was FREE!  

[oramac]

bump...I added a picture to the above post

[Mk1inCali]

I did it on my rejetted (richer, to what Pablo's site says for stock bikes) Y2K edition GS, and drilling just 3 holes did the trick for me, a little better sound and I am pretty sure it opened up the high parts of the rev range.

I like it better now...YMMV.

[Phaedrus]

Anyone got sound clips of their exhaust after they drilled holes? I think it would be cool to have a thread where different exhaust configs can be compared.  

[oramac]

I can make a video of mine with audio if someone wants to host it.

[scottpA_GS]

If you keep the vid. real short, and low res. I will host it for a bit   I am very interested in how it sounds

Just e-mail it to me  :mrgreen:

[cards1128]

I just drilled my exhaust yesterday only did 2 holes to start with very pleased with the sound! Much better than stock. I think i might try one more tomorrow!

[WREX]

In the link that Phaedrus posted - scroll to the bottom.  There are sound files posted there.

[Phaedrus]

Yeah, I see it now.  :lol: And...

Wileyco/Srinath Flange Sound Clips
http://gstwins.com/forum/viewtopic.php?t=15349&highlight=wileyco+sound+clips

Vance and Hines Sound Clips
http://www.gstwin.com/vanceandhines.htm

...for reference and comparison purposes.

[oramac]

http://video.google.com/videopreviewbig?q=GS500E+Exhaust&time=0&page=1&docid=-2392756515604893431&urlcreated=1123979427&chan=Uploaded&prog=GS500E+Exhaust+--+Stock+w%2F+drilled+baffles&date=Thu+Aug+11+2005+at+4%3A45+AM+PDT

Ok, that long @ss address is to a video of my bike hosted by google...you have to download their veiwer, but I didn't have anyone else to host it.