My manifold studs rotted off. I made a short term fix with band clamps and it sealed the leak off well for a few hundred miles. A small leak develope so I figured if I used c-clamps to pull the manifold and y-pipe together, all would be good. No such luck. For the life of me I can't get this thing to seal. Do any products exist for sealing something like this? I was thinking that something like a copper crush washer or some other type of high temp gasket materials. Anyone have a proven suggestions?