Vance and Hines Quiet Baffle Mod.

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Jul 8, 2010 | 09:18 AM

#11

Grendel4

Banned

Joined: Mar 2010

Posts: 5,403

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From: Southwest Florida

Quote:

Originally Posted by jhall201

I don't really like like my VH big radius pipes; they are too loud for my tastes...and they are actually annoying after awhile - in my opinion. I saw that there is a company that makes "quiet baffles" for the radius pipes. I am thinking about buying them but I'm sure if I would need to get my bike "tuned" and ran on the dyno again if I have these installed.

I can't think of a reason to have your bike re-tuned just for reasonable exhaust mods. Unless you're a drag-strip addict.

All the exhaust does is control loudness and exhaust scavenging to a certain degree. And wave reversion, but that's really boring.

At low RPM, when there's not a lot of exhaust gases moving through the pipes, a more restricive pipe may scavenge exhaust gases from the combustion chamber a little better, giving you more 'bottom-end' torque. But once you hammer down on it, the exhaust system can get overwhelmed with exhaust gases and not scavenge from the combustion chamber quite as well. Think of it as siphoning. So, you're gaining power at lower RPM but wasting it at higher RPM.

A less-restrictive pipe will sacrifice low-end torque but pick up power at the ther end.

All the O2 sensor does is read the amount of oxygen in the exhaust gases. It's really not interested in anything else. Well, we can get onto stoichiometry, but I'm confused enough as it is.

So, unless you're dedicated to squeezing that last 100th of a second out of your ET, I wouldn't get too excited about it.