I've had my exhaust pipe on a Toyota Highlander 2005 V6 3.3L as a cat's ass for a while and couldn't fly the drone anymore so I decided to make the exhaust noise as quiet as possible. First, I added a Vibrant resonator (batch #1793; bottle-shaped resonator), but that had little effect on the sound. Then I decided to replace it with a Dynomax 17748. I no longer hear the hum. Sounds the same as buying the car. Please watch my video how it was changed from Vibrant to Dynomax Resonator.