Well I have something like that done to my car.. Except they cut the resonator off and put a Magnaflow exhaust it its place and then did the straight pipe all the way back. It sounds nice and deep! Here's a link to my vids on YouTube.
Are you talking the resinator before or after the rear tires? if you cut the small square one at the end it is barely any louder and you feel no gain at all. If you are talking both resinators, I removed them and replaced with straight 2 1/4" pipe. It actually feels a little slower off the line but maybe a little quicker in the 5k rpm range. I like the sound and it cost me about 20 bucks where as a cat-back would be 200+.