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Old 03-05-2015, 05:43 PM   #1
gearheadstu OP
early apexer
 
Joined: Jul 2008
Location: CLT, NC, US
Oddometer: 88
Carbon Fibre exhaust cans: repack, or modify db killers?

My bike came with a pair of carbon Leo Vince cans:



They sound glorious, like Luciano Pavarotti standing in as singer for a death metal band. But better than that. Thing is, it is simply way. too. loud. I love the sound, but I still want less of it.

Towards that end, I've already bought a set of these rather phallic db killers from LV.



They brought the volume down from about a subjective 12 to a mere 10. I'd be happier at like a 7 or 8.

So: I know I could get a repack kit; pull the cans, drill out the rivets, repack, then re-install. I'm not certain, however, that I'd get enough hush for the time/money spent.

What, then, about the idea of modifying/buying new inserts? With this style of insert, is there a correlation between length and sound levels? Would the exhausts be quieter with longer inserts?
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2001 Aprilia Falco
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Old 03-06-2015, 12:17 PM   #2
jad3675
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Joined: Jan 2008
Location: Cincinnati, Ohio
Oddometer: 132
Nice Falco. LV exhausts sound great on those bikes.

I quieted mine down with an extra half blanket of Moose exhaust packing in each can.

John
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Old 03-06-2015, 03:57 PM   #3
gearheadstu OP
early apexer
 
Joined: Jul 2008
Location: CLT, NC, US
Oddometer: 88
Did you put the extra packing in as an addition to the inserts? Or in lieu of?
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Old 03-06-2015, 06:10 PM   #4
jad3675
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Quote:
Originally Posted by gearheadstu View Post
Did you put the extra packing in as an addition to the inserts? Or in lieu of?
Just packing, no inserts. From what I remember, the LV cans don't have much in them from the factory. Local shop recommended Moose packing over other brands - it seemed more dense and less fluffy than other packing.

John
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Old 03-08-2015, 05:36 AM   #5
ctromley
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Joined: Oct 2012
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I think I know what you're looking for, and you're probably going to be disappointed.

I've messed with a similar problem before. Anything that is more-or-less straight through is going to be too loud. The dB Killer from LV looks like a much more thoroughly thought out solution than most. If it wasn't enough, you're not likely to get where you want to be with those cans.

Sound control is a very complex black art. A good solution will involve flow reversals (at low pressure periods to minimize restriction), chamber volumes arrived at through extensive experimentation, etc., etc. The OEM mufflers are generally the best performance per dB you will ever find, because only they have the budget and R&D facilities to do it right. After my experimentation I ended up with a pristine original exhaust from eBay and couldn't have been happier.

You might want to try some Arrow slip-ons before going stock. They also build for the OEMs. I've seen and heard a pair of their aftermarket undertail cans on a Street Triple, and that seems to me like what you're looking for. There's no shortage of YouTube videos with any kind of bike running any kind of exhaust, so that's where I'd start shopping.
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