Also, the EXUP valve is located in the exhaust mid pipe collector and is not affected with the installation of a performance exhaust canister only.
You might lose some of the mid-range torque but you will gain some extra hp on the high rpm range.
An install like this usually takes twenty minutes although you still may have to adjust the carburetor main and pilot jets to compensate for the higher air flow.
In other words, leave it the way it is;)