Have old exhaust off! Have new 4" from RPM. Having trouble getting it on(need to use this vehicle for work tomorrow) Installing on 2000 ram 2500 2wd Automatic with 8' box. Pipe from the down pipe to muffler does not line up with muffler to well. The pipe that goes to rear of the muffler and over the axleSeems too long, But instructions say nothing about needing to cut it! I really need to get this back together! Any one else had these problems? Thanks George