What does this do? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL650A - 2017+ DL650A - 2017 (L7) and later

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post #1 of 7 Old 11-07-2018, 01:47 AM Thread Starter
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What does this do?

Adding pipe length before muffler.
Can anyone shed a light?
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post #2 of 7 Old 11-07-2018, 06:50 AM
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Stainless steel lower intestine "look"?

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post #3 of 7 Old 11-07-2018, 07:51 AM
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My gut feeling is that it lowers the pitch of the exhaust note. So you get a more "darker" sound.

Pitch is inversely proportional to the length of the resonance chamber.
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post #4 of 7 Old 11-07-2018, 08:17 AM
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Adds weight and reduces power.

There are reasons to change pipe diameter immediately after the exhaust port and for a short distance downstream. But you need a dyno to track actual results to see what works and what does not.

But adding a length of pipe in a circle would go against anything I have learned about gaining exhaust flow/velocity.........

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post #5 of 7 Old 11-07-2018, 09:26 AM
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You need to put one of those as seen on TV air box vortex generators to realize the pull potential of the swirly exhaust.
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post #6 of 7 Old 11-07-2018, 09:28 AM
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Quote:
Originally Posted by realshelby View Post
But adding a length of pipe in a circle would go against anything I have learned about gaining exhaust flow/velocity.........
Agree. It won't help flow rate, but at best diminish it only slightly. Also, it alters the total volume of the pipe before the muffler, so it may alter the backpressure characteristics of the exhaust as well. In order to compensate for that, you may need to alter the mixture, timing and even the exhaust cam profile.

I'm just speculating on why somebody would go through all the trouble. Because the standard of workmanship is pretty high, so either it's a very skilled owner, or a very wealthy owner who paid for very skilled labour.

Last edited by BackPacker; 11-07-2018 at 09:32 AM.
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post #7 of 7 Old 11-07-2018, 10:05 AM
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Because it looks really neat?
Nothing says fast better than a custom exhaust.
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