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Make It Growl For $20

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This post should help you understand what your drilling into. The drawing of the baffle design shows a wall to the left of the 2 outlet pipes. I think that wall is what your drilling into to open up the fist chamber

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This post should help you understand what your drilling into. The drawing of the baffle design shows a wall to the left of the 2 outlet pipes. I think that wall is what your drilling into to open up the fist chamber

missing the link i guess? or i might have misunderstood the sentence :(

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thx gravy, so i am basically going to just dril the external pipes to get acces to the first compartment as in this pic?

DSC03712.jpg

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The way I understand it stick the drill into the pipes & drill only the first wall you hit. If you look at the drawing of the chambers your opening up the first chamber. I'm also thinking of doing it. Just need to get to homedepot

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can someone post a video or something to get an idea of what it sounds like before and after?? i'd really like to do this cheap mod but i dont wanna risk hating the results...

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I attempted this mod but couldn't find an extension that fit down the bent pipe. So I spent $10 & got a pack of cut off wheels & a 1" hole saw. I did the partial gut I think, cutting the little pipes about 1" back. I didn't take the exhaust off or any of the trim. It sounds awesome!! Nice & throaty, no backfires or rattles. IMO it sounds like vid clips of the 2 brothers. I tried using my phone to record but it distorts the hell out of it.

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So.. let me get this straight...

1. Holesaw on extension with electric drill...

2. Insert holesaw into 1 of the 4 outlets in the ehxuast...

3. Once you hit the back, start drilling...

4. Repeat for all 4 holes...

5. Ensure all drilled plates came out of the exhaust...

6. Start bike, stand clear, rev to remove debris...

7. Ride and enjoy...

Really??? That's it??? I may have to do this when the wife goes to work...

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I was waiting for the ultimate hammer blow that would send the bike of its center stand...... :goofy:

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Okay, so I finally did this mod.

1. Used the counter-sink bit... only easier way would've been to use a small cut-off wheel in there. The angled pipe is a real pig to get through.

2. Took 3 battery charges on brand new Craftsmas cordless.

3. Broke my Bosch 12" extension... the drill got so hot (even with oiling it) that it warped the aluminum clips holding the bit in place. As I extracted the extension from the can my bit and both pieces of the lock fell off right at the back of the can... luckilly it happened there where I could get everything out with a long set of needle-nose pliers. Any deeper and I would've been screwed.

4. I did drill the 6 hole version... through both bent tubes and 2 in each backer plate at the back of the second chamber.

I also removed the snorkle and disabled the flapper valve.

Holy crap is the bike nice and smooth now. Not obnoxiously loud, not even noticibely much louder from a rider's position. But down at idle it's much more throaty.

All in all, for 20 bucks and an afternoon... not a bad little mod.

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"Make It Growl" was the best 20 minutes spent drilling and cutting off sections of the two straight pipes (wanted only a 2.5 chamber exhaust) to get a deeper sound out of the sewing machine stock exhaust. Many mental horsepowers were added.

.....and then there was the 2.5 hours spent futzing around fishing, yanking, dropping, fishing, yanking, dropping, fishing some more and then finally cutting out one of the pipe sections that dropped inside and would NOT otherwise come out.

Highly recommend this mod - cheap, (can be) quick, and not too loud. If you can't justify a slip-on system this is a very close second. Just be sure not to drop the cut off section before it's out of the muffler!

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Does anyone know if this thread has been reposted anywhere with working links? Have just spent 2 days remanufacturing the rusted joint from tailpipes to cat, so much do I want to try a version of this mod on the lovely-looking (but sadly Vespa-fart sounding) factory cans of my '05 VTEC. Whilst my dubious DIY TIG skills are acceptable for the unseen clamp joint, I'm hesitant to risk them on a full gutting (yet!)

 

This thread is still super-relevant.

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