Rust is never a good thing when it comes to cars, and one of the parts most subject to rust is the exhaust system. Usually it just ends in a rusted out exhaust pipe or muffler, but this one caused something more.
One of the mufflers had developed a hole over time. The heat from the exhaust then started to slowly eat through the heatshield that was over the exhaust. Once that had rusted or melted through, the next part in line was the gas tank. Nowadays gas tanks are made out of plastic, not metal, so the heat started melting through the gas tank as well. When everything was done, one little rust hole in the exhaust required a new exhaust system, heat shield, and gas tank.
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