The exhaust system on my 1978 Dolphin fell of the other day. Does any one know where i can find a muffler that would be compatible with the R20 engine? None the auto parts stores carry them. I still have the original muffler but the the pipes on both sides of it are too rusty to work with. Is there a suitable substitute that works as well as the original? Also there is no catalytic converter on it. Do I have to put one on? I need to get this thing inspected soon cause she is my daily driver/home right. Thanks in advance for any info you can provide.