Needed a new muffler for Jeep that didn't make too much noise. This muffler fits, no hum when driving on the highway. It only took me 1 1/2 hours to install but I have a good selection of tools and know how to use them. I cut the old pipes off the muffle and cut them as close to the muffler body as possible. The Dynomax inlet and outlet are slightly larger than 2-1/4" pipes so they will fit the new muffler. A couple of muffler clips and that's it. I attached the pipe to the muffler after confirming everything was lined up and was ready for use.