If you go to a higher manifold, it will probably be a little longer as a result. Generally a longer runner is better for low end and mid range, and the shorter runner will produce more top end. It all deals with wave pulses bouncing back and forth. However, that being said, I really doubt you will see any difference unless the length change is extreme.
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2005 Hammerhead 150
170cc BBK, PnP Big valve Head, A12 Cam, Uni Filter, Custom Exhaust, 10G rollers, 1500 Contra Spring, 2000 Clutch Springs
Just added - 2007 Joyner 250 SV - Let the fun begin
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