Anyone know if a FMF hi-flow header will mate to a Big Gun rear box?

I have a Big gun rear box and ordered a FMF high flow header simply because Big Gun was all out and wouldnt have any for quite a while. If I gotta get a FMF rear silencer then fine...

no one??

From what I can remember of the one I had before, the FMF header is the same dia. as the E pipe...

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