Yamaha Zuma

I have a 2003 Yamaha Zuma how would I know if its a Zuma or Zuma II what is the difference anyway?

I want to put a Over Range in it would that be possible? Is there any modification needed?

Can I use the over range on a stock engine?

What would be the best set up I will use the bike everyday and I am always on full throttle I need something fast and reliable.