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If your car has secondary cats, I would relocate the secondary O2 sensors aft of the secondary cats (possibly with defoulers) and go with catless headers. That way you get the sound increase and power to go along with it, while retaining an OEM-looking exhaust. If you want more sound, then get an aftermarket muffler.
There is risk involved, since the secondary cats may not clean up the exhaust fumes enough to pass the sniffer or avoid a CEL. It depends on what you're after and how much risk you're willing to take on. Deleting the primary cats will likely result in a 10-15 whp gain.
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