i cut my rocket silencers 2.5" for the sole purpose of making them look better. they were too long. i didnt notice any noise level change but i think it made it a little bit snappier. how much are you wanting to cut off of yours? if you are talking 2 inches then no rejet is going to be needed and even if you cut them in half im very doubtful its gonna change much. if you have a silencer thats got one end just riveted on you can drill the rivets out, cut everything down, re assemble, drill new holes and put some small screws in. its a pretty simple process. just remember however much you cut off the outside is how much you have to cut off the inside tube...