Now, for the exhaust. Do you have the large chamber on the back of the motor? If so, PITA to get out and back in. But, if you hollow it out like mine, oh boy. You will love the sound. Very loud though, but unique and loud. Is heard over 2 miles away. Sound imitates a big block.
Actually, funny thing. My boat back fired real bad years ago as well and my chamber blew apart as well! It was already hollow inside. The 1st owner severely overheated the motor and cooked the internals of the muffler bad. And he just did a cob job of fiberglass repair, he just used the mat stuff, not the woven.
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