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You did not tell us anything about your motor.
Bob is correct.
Maybe you need to change the cam. Or motor.
Changing the side pipes is the cheapest and easies to do. Then if you want more, then do the mods to the motor.
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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