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IIRC there is some restriction but not large enough to care. Hence the advises like to consider catback mostly only by sound one wants to get, not for performance sake. Yes, you may get a little bit with 2.5" or even more so 3" exhaust, but so will grow loudness (even more so if in combination with catless header), performance? Not so much.
Keeping one of stock cats is normally almost sure way to pass emissions tests. And if it's choice between 1st or 2nd cat deletion, 1st, in header, hurts performance much much more.
So you should be ok with going for catless header + stock catted frontpipe, you won't loose much. Remember to get tune for new header though, to get it's gains fully (and to disable cat readiness check for CEL to not appear).
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