answering the original post...
I used to live in Sarasota where ALDIVE is located... Florida does not check for emissions so you are lucky, and can do what alot of ppl wanna do to there exhaust's but cant due to strict emissions laws...
3rd gen's do not have a 3rd Cat. It is a resonator for those who didnt know... just another sound deading device... i apologize if someone already covered that... also there is no 02 sensor after the resonator at all... the only 2 sensors are behind each cat located on the Y-Pipe.
if you go on youtube and type in " caldwell exhaust " the 1st video is ,my X... custom Cat Back Exhaust - 2.5'' pipe in ( NO RESONATOR ) FM Delta 40 series, then 2.5'' out to a 3'' tip...
the video was taken about 3 hours after install... with my INTAKE and since the muffler " wore in " the sound is a little better...
hope this helps you fella