I WOULD BE HAPPY TO LOOK AT THE EXHAUST YOU HAVE NOW AND GIVE YOU A FREE ESTIMATE. A HI-FLOW CAT IS ABOUT ONE HUNDRED DOLLARS AND FIXING THE REST OF YOUR SYSTEM COULD RUN ANYWERE FROM 30 TO 75 DOLLARS P.S I WARRENTY ALL PIPES AND HANGERS FOR LIFE N.T.C 813-910-2731