I recently gave my 06 Charger R/T w/R pkg. to my 16 yrs old cousin as his birthday present. The mileage is currently at 70K miles, I want to refresh the engine by taking it apart, for inspections, and performance upgrades. I basically wanted to know that after I've put the engine back together, should I reset the mileage reading on the dash or just leave it alone. (I took apart three other engines before but never knew if I was to reset the mileage reading once put back together and running good in the vehicles.) Please answer so that I can begin on this project. Oh, yeah is it a good Idea to also add in a supercharger in it?