I have a 17 T/A with the 5.7. It also has the active exhaust. I've been looking at a lot of exhaust options. Which brought me to the Borla Atak cat back as my final decision. 1500 bucks is a hard pill to swollow when it's identical to the factory exhaust (2.75" and a X pipe), minus the resonators and mufflers. I've already had a mid muffler delete, I might as well just replace the factory resonator with a Borla Atak resonator. Which brings me to my question....what model is the Borla resonator, or is it a muffler to replace the resonator?