I also just installed this kit. 3 of the bolts were seized and needed some persuasion but they all came out without snapping. It took far longer than expected and the crank case vent valve needed to be pulled(which also had a seized bolt). In the end I don't have any more exhaust pop than before . The only thing I noticed is that the sparkplugs have less carbon on them. I know this because I pulled the plugs thinking my new plugs would arrive in time but they didn't so I put the area in and old plugs back in and rode for another clue hundred miles.