I have a 2011 Tahoe which is my wife's and I want to put an exhaust system on foe better flow/performance. She DOESNT want it loud. She had exhaust on previous vehicles and just doesn't want it to sound loud. I'll leave the noise to my straight pipe on my diesel:waytogo:. I have used mangaflow in the past and love the product. The only cat back system I had seen is the #16564 on summit. I'll eventually get an intake and programmer but I won't do too much else on her ride, per her recommendation. For those that have this system is it about the same loudness as stock while cruising? If anything is much louder than stock she don't want it. Thanks