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Old 10-11-2012, 12:23 AM   #3134
Cam Killer
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Joined: Jun 2005
Location: SF Bay Area
Oddometer: 7,341
Originally Posted by cug View Post
I think it's partly the stupid exhaust valve thing that kicks in at certain RPM...
Does the wethead have that valve?

I think it was more for extra back pressure to increase torque at low RPM a la Yamaha's EXUP system than it was for noise.
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