Yeah, something in the $250 - $350 range picked up is about right...
I wouldn't be overly concerned with HFC's voiding a warranty for the drivetrain -- it's more that if for some strange reason they failed, Nissan isn't going to replace your cats. Otherwise, its a pretty safe and reliable mod with solid gains (and environmentally responsible to boot).
As to a tune, I'd say not critical, but recommended for a cat back and highly recommended for any swapping out of the OEM cats.
I'll make one other point that frequently gets lost in the shuffle: Changing the exhaust set up on this motor and not getting any hiss or rasp is tricky...
HFC's and TP's need resonators.
Larger diameter Y pipes (and allegedly, aftermarket H and X pipes) tend to make "whooshing" sounds.
And so on...
Before you commit to any exhaust (other than the S-tune, which is, frankly, of poor quality and makes virtually NO extra power, or the Nismo H-piped take off, which does make decent gains) make sure you do a good bit of research to establish what if any weird rattles, hisses, or rasps will crop up...
Good luck!
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