Higher octane gas won't do squat for performance in these machines, and in some cases, can even rob power. Changing the compression in the motor would come into play with higher octane, but not stock. Amsoil is about as good as an oil you can get, 0-40.
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2006 650 V2
A few bolt ons 
2006 GSXR750
A few MORE bolt ons
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