2015 GMC Sierra SLT crew cab with the 5.3L v8
I went with the Borla cat back exhaust. I purchased it online from JEGS and it was $990 shipped. Midas Muffler installed the kit for $150.00 and the stock exhaust came off in one piece. This is the aftermarket exhaust, not ordered from GMC so there is no flapper. It gives a nice rumble when you start the truck but then becomes very quiet at idle. When your under power there is a nice noticeable rumble exhaust note, I love the sound. When the V8 switches to V4 at cruising speeds you can hear a slight drone if you know what you are listening for but if you have the radio on, even at a very low volume, you don't even hear the exhaust at all. This exhaust is Not the Touring exhaust that you get if you purchase it from GMC. It is the sport exhaust which is a little louder that the touring but quieter that the next up exhaust which would be the Attach exhaust.