I belive it's the same kit I installed in my 05 it adds an extra filter under the cab with the fuel heater a higher perssure fuel lift pump and the fuel pipeing and wireing harnesses. Also there is a computer setting change to allow for the extra water in fuel sensor. The kit was developed for extra protection when running Biodiesel it allows you to use B20. The extra water sep filter I belive is 2 micron. It's cheap insurance to protect your fuel system.