the stock cats have a lip that fits inside the exhaust manifold pipe, goes in about 1/4 inch with a copper ring around it to seal it. I was unable to use this on my Berks because they dont have that little lip for the ring to fit around. If it does in fact begin to have leak issues, I'll go to the berk site and buy the gaskets.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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