I use a Sawzall, i could never justify saving a stock exhaust on any vehicle, especially for the reason of where the hell would i store it?. Even for re sale, who would not want an aftermarket exhaust?. You can by a Kick a*s 4" exhaust for under 500 bucks. If you have the room to store it, and really want to keep it, just use a torch and pry bar and you can usually get it apart without too much trouble.