I'm quite a ways off from messing with my exhaust further, but I imagine mine will eventually be a single as well, someday. I think it would weigh less, and it would be easier to do a rear diffuser. Maybe move the rearmost section and the exit way up high to clear the diffuser completely.
For now I'm happy with my FI catback, although it's getting a little worse for wear (I've banged up the cans spinning out over tall kerbing...).
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