I just got done hanging a banks 3 inch cat back monster exhaust about a week ago along with a K&N cold air intake. As far as install, you'd be a dope to pay someone to do this for you, it wasn't that hard, i put the right side of the truck up on ramps front and back. as for the power, yep, it's there i can go the same speeds but with lower RPMS (25 MPH @ 1100 RPMS, 65 MPH @ 1950 RPMs on flat land, no load no headwind), sound, well, you're never gonna think it's a V8, the tone is too reedy for that, has a nice low drone at idle, at freeway speed, yeah i can hear it, but ain't that the point (partly)? At full throttle it makes the whole truck vibrate. Personally, i don't mind hearing it at speed, besides i usually have the stereo turned up too loud to hear it anyways.