| Have you had the cams dialled and all other standard stuff optimised, e.g. TPS, injectors balanced, valve clearances etc.
Maybe get rid of the air intake mesh?
Certainly worth doing to make sure you are getting the best from what you have before you put a power commander on.
Not so sure about bolting a bigger diameter system on, you might lose some low or mid range torque/power or maybe not. if it was me I would want to be sure with a before and after dyno run on the same dyno.
Ray. | 
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