I have a 2013 S6 and I did the resonator delete with straight pipes. That lasted a few weeks. Then I felt like I lost a boatload of torque, not proven by anything other than butt dyno. So I then put in a magnaflow xpipe and removed the straight pipe. That lasted for about 3-4 months. Improved torque, again butt dyno, and nice sound. However, it wasn't enough so I then pulled the trigger on the AWE touring. In hind sight, I should have just gone AWE from the beginning. It would have saved time, effort, and money.
I am very pleased with the AWE touring result in sound and power. It was what I was looking for all along. My $.02, go full exhaust from the get go.
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