I know the Dr. Gas X-pipe advertises that it will fit both BBK and MAC long tubes. I think it it because it comes in pieces and has to be assembled. This would allow it to fit most any long tube with some fab work. Flowtech sells an X for long tubes but I don't know if it will fit the BBK's or just their brand. You could always just buy the universal x and have the rest of the pipe fabed also. Hope this helps.
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