Ummm the only thing I see is a DECLINE in power... the exup valve is a control of exhaust backpressure... its a known fact that less backpressure is NOT always good for low end acceleration. Like for example if you put a free'er flowing exhaust on a car or bike you will lose low end HP and torque but you will increase a little on the top end hp... the EXUP valve is designed to increase backpressure so at lower RPM's you dont lose that power and then to open up as it gets to higher RPMs so you have the best of both worlds.... by removing it you probably just lost out 10% on your bottom end power... (and didn't do anything for the top end since it should be fully open at WOT anyway...
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