Save yourself the time and headache to have it installed. $100-$150 to save 7 hours of your time and potential problems. Installation looks like a nightmare without a lift too. I'd recommend having hangers welded on to the race pipe too (the torque from the motor pulls the pipe forward, I had a weld failure on one from this)
ive heard it changes the sound a lil bit.. but not much. Youtube has a lot of videos of just the RP and DP installed. Ive heard the DP is a complete PITA to install!!!!