My car is catless and there is no muffler, just 4" straight pipe, I think that maybe cutting the resonator off and leaving the muffler, or even replacing the muffler with the shortest glass pack or straight through magnaflow muffler you can find, I don't like how the resonator makes the car sound, to me it just doesn't sound right, you have a high performance exhaust on a turbo car, it should be loud as balls and there should be some raw sound coming out, albeit my straight pipes are pretty ridiculous and ill probably throw a glass pack in the midpipe or something, if there isn't at least a little bit if raw roar it just sounds like someone put a fart can muffler on a Pontiac sunfire and left the rest of the exhaust stock.
Something I have discovered, I use it as a rule of thumb when people ask me how to make their cars sound a certain way.
Muffler at the back of the car you get more raw, roaring sound
Muffler in the midpipe (or adding a resonator to the midpipe) will make it sound more refined and "muffled"
The closer the muffler or resonator is to the front of the car the "smoother" it sounds. The farther back the muffler is the more rasp you will get.
Keep in mind the type and size of muffler as well as how many play a large roll too