I put flowmaster super 44s on my RT and had the stock reso's removed. I love the sound but the drone is ridiculous. I'm thinking about putting some Vibrant resonators on it to help kill off the drone. Vibrant makes a 12in and an 18in bottle style resonator. Any suggestions on which one I should use? Will the 18in reso even fit? I'm not really an exhaust fanatic, just want to get rid of the drone.