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Looks like you had a pretty good exhaust leak. Maybe a bolt wasn't tightened enough. Or maybe the mating surface on the manifold, or exhaust housing wasn't flat. Or the gasket just failed.
Maybe that one bolt was tightened down first and then the gasket was moved to put the other bolts in? Doesn't look like a blow out, looks like it was torn.
I would also say exhaust leak but it looks like one of those thick metal gaskets. I would use a OEM gasket and OEM bolts and washers(2 washers per bolt) and don't forget the anti-seize. Off the top of my head I believe the bolts are torqued to 48-49 ft/lbs. Never had a problem with that set up.
I know, it looks like torn, but it is infact a blowout!!? If a thick metal gasket like that couldn't stand a chance, what makes stock gasket work? I have the stock over size one on there now, but incase I need another if it happens again, what is the part number for the stock bigger hole gasket?
ANY gasket will explode with a loose bolt. Here is my old gasket, thankfully I have spares, one of the turbo to mani bolts backed out causing this on mine.
There is another really good solution for this. Have the surfaces machined or sanded flat, and don't use a gasket at all. I don't use any gasket on my turbo to manifold flange. If it's smooth enough, you don't need one.
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