From what I understand you will definitely want to add on another resonator into your system. I have been thinking about a race header as well. I am thinking of addind in a cat and resonator to try to tone it down some. By doing this I hope to keep it at the noise level that it is currently at.
VERY VERY LOUD!!! i have heard the vibrant with the r/t high flow cat and it was like a cannon when they got on it. i've also heard the MBRP with a r/h and you could hear it from 1/2mile away with no problem.
my suggestion: get a quieter exhaust, sell the vibrant. if you really are worried about getting a ticket this is the only sure way to do it. you can get a resonator welded in, but again you're talking more $$. i'd get the FS quiet exhaust and save your ear drums and keep you away from the dreaded fix-it ticket.
i'd have to agree with shiva on this one very loud i have experienced it riding next to a race header +vibrant car and you can't hear your car when riding next to it and then i had it on my car and with windows closed it was unbearable .now i have the borla and it is so soothing