Stop replacing your entire exhaust for a simple leak

I see posts all the time where someone blows $400 on a full cat-back because their muffler has a tiny hole. Just hit it with some JB Weld ExtremeHeat. I fixed a rust spot on my 98 Civic for 8 bucks and its been holding for 6 months now. Anyone actually test that stuff before shelling out for a whole system?

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terry18h ago

JB Weld is decent for small stuff but you gotta be real careful with exhaust patches... that stuff can crack if the pipe flexes too much. A 98 Civic might be fine because the system is pretty simple but newer cars with more complex bends can't handle a rigid patch like that. The real issue is that a muffler leak usually means the whole thing is rotting from the inside out anyway. I'd rather pay a shop 50 bucks to weld a proper patch than risk a JB Weld failure at highway speed. That 6 month test is good but wait until winter road salt hits it, then you'll see if it really holds.