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Old 07-03-2012, 09:40 PM   #1
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Aftermarket quieter exhausts?

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I've seen a lot of aftermarket pipes for more power, but are there any that take a bit more of the edge off the volume? I know it's not the same thing, but I also drive a dirtbike, and there are products like this and this that can noticeably make the exhaust quieter.. (many group ride events have DB limits, and won't let you participate if your bike is too loud).

Or is this just where everyone says to buy an electric?
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Old 07-03-2012, 10:01 PM   #2
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Re: Aftermarket quieter exhausts?

What engine are you considering?

Asking as recommendations for other muffler options may be available. Here are a couple of examples of retrofitting.

I'm a fan of Fox engines for their power and durability, but always hated the rather high noise levels. For both the 50BB and my newest Eagle IV 60 I fabbed adapters to fit different mufflers. The reduction in noise was considerable with no discernible loss of performance. Both are equal to or better than the rest of my motors in that size range.

Basically the rule seems to be that increasing the muffler volume allows for greater time for cooling before the gasses flow out the exhaust. Due to that cooling the volume of exhaust actually drops till the outlet can be smaller.

Here are a couple of examples. First is the 50BB and the adapter allows for the more common muffler dimensions such as those for the OS 40-55. The use of internal baffling does not seem to make a huge difference in noise, but does affect the pressure at the vent fitting.

The second is the Eagle IV and the muffler option there is much larger and longer. Can't remember the make, but it is nearly identical in chamber size to what comes with the GMS47 and ASP52, (the main difference is this one does not disassemble). In that case the noise level is quite a bit lower than even the 50.
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Old 07-11-2012, 05:24 PM   #3
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Re: Aftermarket quieter exhausts?

Putting on a plane style muffler will cut out a lot of power compared to a tuned pipe, but it will be quieter. Most aftermarket pipes will actually be louder than stock too.
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