Ok I don't want to sound like a pita but is sugaring really bad for a 340 HP GN? Can some of that slag break off and find its way to the turbo? As you guys can tell I REALLY don't want to remove the header if I don't need to. Spent all day today practically removing the turbo (like 3 times) to replace the copper gasket, then to align the downpipe, remove rounded out nuts holding the turbo to the header, etc. Could JB Weld hold up? I have a smoke machine which is how I found the crack.