Hey guys I just bought some Magnaflow 3.5" 15 degree angle cut bolt on tips with hangers off a Magnaflow catback exhaust from a member on Mach 1 registry. They measure 12 inches at the bottom and around 13 inches at the top but over all length is 16 inches which is about 4 inches longer than the factory tips. I want to do the install on my own but dont know what tool to use to cut the factory exhaust tips off, also about how many inches would I leave to be able to bolt it on. I want them to be in the same placement as the factory tips. I tried a hack saw but there is not enough room to do the cutting. I got these because I have a MAC Offroad X and Flowmaster Original 40's welded in, its just something to give it a bit of a better look without having to invest in a entire catback since it sounds pretty nice already.