Well you could have just used the search option, so you wouldn't be flamed like you are now. The performance increases w/o the resonator has been proven on the non-SVT and SVT dual exhausts numerous of times. Also, I bet there are alot of non-svt exhaust guys out there including myself who will disagree iwth your initial argument being that then aftermarket cat-back system is not very beneficial. I for one had the SE exhaust system and upgraded to an SVT system w/o resonator, and can feel substantial differences in torque. Although, I do not have the actual dyno readings to contrast there are those whom do.
Your prior opinion of sound of the car w/o resonator is merely that, an 'opinion.' Many cannot stand the drone produced by removing the resonator and go to such aftermarket resonators such as magnaflow as I believe SVT Pete stated.
All in all, you're a newer person on this thread so your credibility isn't there compared to someone whom has experience on the board. Now, that doesn't mean that your ideas are less valued, it's just htat nobody cares about opinions if they aren't backed up w/ evidence.