Thanks. Installed the lower pulley and stage 2 tune today. Took it for a bit of a spin just around town, definitely makes up for a bit of the torque loss going to the V6. Although, since I’m at 5200 feet, I guess this is what stock feels like at sea level. Unfortunately it’s rush hour so not like I had a chance to make any hard runs.Yes. It saves the old checksum
For anyone else wondering, once the stage 2 file is on there the Vflash adds a menu option to flash back to original.