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I do not have the Greddy RS Cat back but I have the Greddy EVO GT cat back which is also the 3 inch. when I went to install it, it came with a 3inch gasket for the connection to the stock front pipe, so I simply removed the donut gasket from the front pipe and made sure the surface on the front pipe was smooth and then used the gasket with a little high temp RTV. I had absolutely no leaks at all I just made sure when I did it the first time the bolts they supplied were nice and tight. Hope this helps.
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