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I have these and they're quiet. The only time they make noise on a 300 is when it's at 2.5RPM's and the drone kicks in after letting off the gas. There's no performance gains so keep that in mind. My next investment is going to be a QTP electric cut out with dump tube and keep these just for looks.
I had all three of my resonators removed, with Topspeed mufflers. Not the best video but it's all i have for now. Weather is so bad lately The two resonators closer to the mufflers are kinda pointless to remove it seems. The one that seemed most influential was the single resonator towards the front of the car.