Quote:
Originally Posted by buggymike1976
I / Thanks all does any one know if lack of back pressure will affect the way it runs or re jetting
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yes it will affect performance. As a rule... more back pressure= more bottom end , less = more top end. Subtle changes in pressure moves the power band up or down without effecting jetting. Drastic changes as in gutting a muffler most likely will affect jetting.