I have a 2011 SS1. I went to Midas (big mistake) to get a hot sounding exhaust system put on. They completely muffed it up. They removed the entire exhaust sytem except catalytic converters. Put a (1) Magnaflow muffler on it. Sounded OK but not what I wanted. Wound up ordering an axle back FlowMaster American Thunder system & went to a custon exhaust garage (Muffin Muffler Austin TX) had it installed. Sounded great! One problem is when accelerating or when you are going a steady speed (40 50 60 70 ) it sounds like it's under water. Dealer told me it's because Midas removed the baffels and that the engine shifts to 4 cylinder. WTF it's a muscle car not a Mom & Pop car. Going to Muffin Muffler Monday to have baffels put back on. Hope it solves the underwater sound.