I'm running the KTeller 3" with a Magnaflow muffler. No cat or resonator and it's not very loud, it sounds deep. Not the least bit raspy. I took three short 5 second video clips from my digital camera and sent them to ya rus. It's hard doing the camera work and driving. =P It almost sounds like I have nothing from the camera. Let me know if you want longer clips or something. These are what I just took driving down the street.