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I see you've changed the title of this thread. The Invidia R400 is a catback. The headers have nothing to do with fitment to the catback, as there is still an over-pipe (The one that bolts to the header and snakes over the front passenger axle) and front-pipe between them.
I still have no idea what you're asking or what your goal is. Are you trying to reach a certain volume level or sound?
If you have a stock over-pipe still, then any header would work except for maybe some long-tubes.
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