What would you recommend I have done? I am having my UR pully's installed as well as my 3.9 final drive gears. I already have a JWT pop charger, Boral TD, and Labree test pipes. My test pipes don't have the bung holes for the O2 sensors, should I have them drilled so I can hook the O2's up (I have an 03) or does this not make a difference? What lube should I use in the differential, Royal Purple? Should I get my A/F timing adjusted, dyno tune? Thanks for any suggetions.