Really? Is herculiner an undercoating or a truck bed liner? Cause while undercoating is naturally kind of gooey, bed liner should hold up MUCH better to heat and not be as much of a problem. I think that if you keep it away from the turbo area, the rest of it should be fine in the exhaust path, it's not like we're running cast iron pipes, just the turbine housing, the rest is thin walled pipe, and cools off rather quick.
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Rotaries:They are NOT that complicated!
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