It wouldn't be too hard to build your own. Take a pattern from the stock fascia cutout for the tip, trace it on the right side and trim it out with snips or a good pair of scissors. (I saved the piece, JIC I ever want to return it to stock.) Then get a single inlet/dual outlet muffler such as a Flowmaster for a 3rd Gen Camaro and have a shop mount it up in the stock location with the stock tailpipe on the left and a mirror image duplicate on the right. (Sorry the pic is so dark.)