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Exhausts Exhausts - Headers, Mid Pipes, Mufflers


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July 30th, 2017, 04:31 PM   #1
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Outlet size

Has anyone determined an ideal outlet size in their end cap with straight through mufflers?

Too open and we don't run an ideal back pressure.

I understand there are differences in engine size and work done but if there were a range responses a generalisation could be made for my application.

Thanks Guys.

Al.
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July 31st, 2017, 12:07 AM   #2
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jeez! you'd think we were running GP bikes!

35mm unleashes another 1bhp on a husaberg so I guess 35mm plus....

taffy
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July 31st, 2017, 01:02 AM   #3
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Bundy bear and popup or weed posted good info on that Alan.

They don't have many posts so should be easy to find I'm on phone so good luck
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July 31st, 2017, 01:21 AM   #4
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Hi Alan, I'm running open pipes, 2-1-2 and the next job on the list is to make reverse cone inserts for the outlets. There are so many variables that to get the best performance a lot of Dyno time would be needed. Getting the right back pressure and cone angle will force the gas to accelerate out.
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