I'm actually surprised Ford does not manufacture a mustang exhaust note that resemble the deep rumble & pulse heard on Borla S axle backs...I was completely taken back when I first heard the stock exhaust on my 2011 GT, talk about quiet!!!
They just did not sound like they belonged on a 5.0 coyote...
2011 GTCS Candy Red;Premium leather interior package, Remote start, security package, upgraded speakers, 6MT 3:55. 35% tint all around, Borla "S" axle backs, & clear corners.
The rest is all FORD