$558 for tires, install, Manual CCT, valve adjustment, spark plugs, brake fluid, brake flush, oil is a pretty good deal. hope he's not just sitting on your bike for 3 days and saying he did everything.
After he's done charging you, take it to another mechanic to verify anythings been done.
Oh, and the point of the PC3 is to add more fuel to compensate for the increased air flow in and out of your motor. You can remove it if you want but you'll be running incredibly lean and it will be detrimental to the health of your motor. Have fun with that, your mechanic is an idiot =)