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[gorillaman]

I heard there was a thread about doing this mod on this forum but I cant find it.

Anyone know about it.

I heard someone used a 1.25" hole drill going from front to rear. Rear being in relation to the bike. But 1.25" seems pretty big???

[Para Bellum]

We need more info to answer.  Are you talking about drilling out the catalytic converter in the header, or is this about the baffles in the mufflers?  People on here have done both, plus there's a third modification:  removing the stock baffles from the mufflers, and replacing them with aftermarket baffles.

Let us know which of these it is, and also the specific bike being done; then we can give you the right info.

[gorillaman]

Drilling the muffler pipe from the front to rear. Not the header. I guess drilling the baffle would be more accurate

 

[SHRADER]

The thing you want to drill is basically the other end of the tube that you can see out the end of the muffler. Harley pinches the end of the round tube down into an X so that the thing kinda looks like the ass end of a torpedo closing the tubing off. Get the proper size hole saw, I can't remember if it's 1.25 or 1.5 inches, and with the muffler off the bike, look down in the end and you will see a lip where the outer most tube joins with the tube that is closed off. If you saw the joint out, the x'D off tube will fall down and you can get it out of the head pipe or entry end of the muffler.

Once this is done you can look all the way through the muffler from one end to the other and the bike will be noticeably louder.

[gorillaman]

I remember a friend of mine (on his 2011 EG) just had a piece of 1/2" rebar and punched through the "X" with the mufflers still on the bike. I was surprised that the mod actually made the bike sound throatier. I know too big a hole and the bike sounds like crap.

[ultrarider123]

Or you could use this method...

http://www.cvoharley.com/smf/index.php?topic=74847.msg1027930#msg1027930

This method worked on the mufflers before the MoCo put the 3" extensions on their stock SE mufflers (2013 or 2014 I believe).  The extension comes off very easily.  I've removed mine on my '15 because it was rusting and making a mess.  But I haven't removed the plug....yet.

Good luck on whichever route you choose.

[gorillaman]

SHRADER:

My CVO's have the extension that comes out... I looked down and did not see the "X" like on other years. I dont want to peel the welds off just yet. I might take them off and look a little closer.

 

[SHRADER]

I don't know that you can see it without a flashlight, in Haird post you can see what I was talking about the extension with the torpedo end that has to be removed from the larger tube extension that sticks out the end.

What year and model is your CVO?

[HUBBARD]

The thing you want to drill is basically the other end of the tube that you can see out the end of the muffler. Harley pinches the end of the round tube down into an X so that the thing kinda looks like the ass end of a torpedo closing the tubing off. Get the proper size hole saw, I can't remember if it's 1.25 or 1.5 inches, and with the muffler off the bike, look down in the end and you will see a lip where the outer most tube joins with the tube that is closed off. If you saw the joint out, the x'D off tube will fall down and you can get it out of the head pipe or entry end of the muffler.

Once this is done you can look all the way through the muffler from one end to the other and the bike will be noticeably louder.

Or, you could do like normal people, that ain't so tight that they squeak when they walk, and buy you a set of Pipes!!  Seems to me, if one could afford a CVO, one could afford a set of Pipes!!!  Jeez....just sayin....... Later--HUBBARD

[CVODON]

Not sure anymore why anyone would buy a set of A/M slip-ons when Fulsac baffles and a hour of time will give good results.

[gorillaman]

 

My mistake... I have a 2016 FLTRU. I got the CVO pipes for a steal on Ebay. They have the long thin baffle like this

-/------\_   in them. .. not the torpedo ones like this ]-----X 

I looked at the link provided above. It had some great pictures of the "X" you speak of but that's not these pipes.

I also understand the... Affordability claim... But as most of us ... it gets expensive experimenting. My last mistake involved hand grips. The Get-a-grips from HD were claimed (all over the net forums) as superior in all ways to stock. A few associates had them and boosted their claims. I bought them... WOW... that was a waste of $125(CDN) ... worst grips in the world (for me). They felt like a pine cone crossed with a cactus.

I like tinkering and I and still looking to find causes for very minor vibrations. Changing pipes (I have 4 sets) alters these vibrations significantly so I'm leaning towards and alignment or mounts. But thats another story.

I do like the look of the CVO pipes so I might look around for some 1.75 fullsac which would be the quieter ones I think. I did notice with the CVO's I have on now, that the bottom end loses a little in the power range over the stock ones.

Anyway... it would seem that most on the web forums have high praise for fullsac... 

[GMR-PERFORMANCE]

install the fullsac baffle kit and not create any tuning issue .. I have tuned a few that have been punched drilled whatever and it can creates some odd tuning problems . Had one that had a odd dip in the tq curve .. I asked about the mufflers and the guy had rammed a steel bar through it ..    with the cost of the bike seems silly to stop .  The baffle kit is low dollar and works great .

[gorillaman]

After further consideration... I think I will keep the CVO's as they are... but invest in a Gutted Header instead. That should ease up the flow ever so. I am hopeful it will smooth out the performance range on them as well.

[Para Bellum]

... but invest in a Gutted Header instead. That should ease up the flow ever so. I am hopeful it will smooth out the performance range on them as well.

If you put on a non-cat header (of any type), all of your mufflers will be considerably louder, even the stock ones.  Plus,with less restriction in the exhaust system, you will have more flow, and you'll need to re-tune the fuel map--and if you put on even less-restrictive mufflers, the more you'll need that re-tune--since the stock fuel maps are extremely lean to pass the EPA.  Both performance and longevity of your engine will suffer without tuning.