you will need to take it to a place that can cut a section of pipe out and put a couiple of new joins/clamps in. yes it can be done. it will work just the same as a decat thats a straight fit, infact its an advantage having a miltek one as you can use it if you upgrade to an aftermarket exhaust, on a downside, your standard cat will not just fit back in without another pipe/reducer being made up, if you ever need the cat back in that is.