I have a UPR on one of my cars. Fitment was decent. I didnt have any real issues with it. The best one I had that didnt have any issues with and fitment was great was a Magnaflow x pipe but by the sound of it thats more than you want to spend.
Yes the pedal did vibrate before I replaced the fork. I also had to replace the ball/dentin because that was wore out also. Before I replaced them you could move the fork up and down, side to side.