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If cost isnt too much, just find another catback. But you're talking roughly 3mm difference in piping. Also, I don't know if you got the Q300 for a quieter noise, but I'd get them to figure out a way to make it work.
As for everything needing to match, look at it this way: you can have just the catback. But if you're going to do the rest of your exhaust, just get headers and leave the catback. The midpipe/ overpipe don't make much difference.
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