I want to buy a 3 inch catback, and it has a 3 inch flange to hook up to the downpipe. i plan to get headers later on when i get the money... but for now does anyone sell a flange that gos from 2.5 inch to 3 inch so i could bolt up this catback? I want to keep the catbacks 3 inch flange, and have the downpipes 2.5 open up to a 3 inch exit.