My truck came with the Mopar/Borla muffler but it didn't seem loud enough to me. I ran powersticks in with everything else stock and it sounded good to me. Then I bought some Gibson headers off of Noid on here, and the truck sounded really good, BUT I have always wondered what it would have sounded like if I had left the Borla in there, and added the headers. I can always go back to the Borla since my buddy still has it laying around, and I'm sure he'd give it right back if I wanted to, but don't know if I want to go through the hassle. We'll see.