Everyone just cuts the flanges off the stock piping and puts them on the new piping, and if the"exhaust guy" did not know this, run ...run very fast away and never look back he is a fool. Any midas can do it, and they do all day long...otherwise you can order the new 2.5 flanges online at a hundred different places, but for 2 1/4 their is no need for new flanges....again the exhaust guy was just an idiot.