I have used it many times on my Snowmobile exhaust systems which I would be willing to bet get hotter than those will. If it is good quality stuff than it should hold up just fine. Thats not too say that somewhere down the line I wouldn't replace it with the actual gaskets. I do recommend re-applying the liquid gasket at least once a year though to maintain it's sealing ability.
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2010 Ford 6.4L Power Stroke Diesel: 588whp/1082wtrq
2007 Dodge 6.7L Cummins Diesel: 788whp/1405wtrq, runs 12's @ 7400lbs, Still miss my 370z!
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