Zakly what I was thinking. Have that in the rafters of the garage. You said those #s were right for Dart which is supposed to be like 3 inches longer.. I had under car and compared rightafter I brought home.. As I recall...I think that front pipe will work if/when I eliminate the CAT. I think tailpipe looked very close also. Just how it would go together something was off... I think the muffler is too long. I could double check them, if that muffler might be right for Hoppy.