Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
At the back of the converters should be little pressure on the system. Have you checked to see if the muffler is restricted causing back pressure after the converters?
There is only one gasket there. My suggestion is to split the pipe back open, knock out or drill out the studs if it has not been swapped over to nuts and bolts already. Then block sand it with 40 or 60 grit paper to get both flanges back flat and take the war out of it. Then go back with stainless steel nuts and bolts and a new gasket.
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