I had flow master super 44s with kooks long tubes on my 2010 auto rt and a lot of people said it sounded great but to me it sounded weird. Kinda sounded like it was underwater at idle. It was loud when you stomped on the gas. I just went to magnaflow magnapacks and like that sound a lot more. The car also feels peppier with the magnaflows then it did with the flow masters. Also when the MDS kicks in the flowmasters made it sound like a prop plane taking off. Just my .02 .