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I just ordered this header with the high flow cat and I am wondering if I need to get a new gasket for this. Do i need one for between the header and engine? header and cat? cat and exhaust? I don't know much about this without having it in my hands. Also, this bolts right up to the stock exhaust right? Thanks for the help

 
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Shouldn't the header come with any necessary parts (gaskets, bolts, etc.)? If not, then the header should be made to work with the existing gaskets and so forth.