I removed my resonators when I added the GT500 axelbacks and absolutely loved the sound. As others stated, no drone and no rasp. The stock resonators do pinch down so you should get better air flow with resonator delete pipes. I just recently added cat deletes and now it is very loud! No drone, definately raspy above 2,000 rpm. I think stock resonators and cat deletes might have been a good a combination. I will likely be adding Pypes M80s at some point soon.
2012 GT, Brembo Package, MGW, FRPP Tune (removed), GT500 Mufflers, Lethal over axle pipes, Steeda Non-adjustable Upper Control Arm, Eibach adjustable lower control arms, BMR relocation brackets, BMR panhard bar, Eibach pro kit, Tokico D-specs, GT500 strut mounts, Forgestar F14-19x9 and 19x10, Michelin SS-255/40 and 285/40, Redline hood struts, DSS aluminum drive shaft, Whiteline transmission bushing insert, Jegs cat deletes, SCT iTSX, Bama tune