i think you're looking to create an axle-back flanged muffler, that you can interchange with another muffler (probably your standard one). if you go to any exhaust centre, they'll have a look at the dimensions of the muffler and determine whether it will be able to fit without too much modification, or won't fit at all because of the size and shape. if it does fit, most places will do the job for around $50-$100 depending on the steel -whether it is mild steel, stainless or polished stainless - and size of the piping, as well as the flange type. i hope this helps! good luck with the muffler.