I used this on my 2019 GT Charger. I removed the mufflers and resonators and installed Magnaflow mufflers. The car sounds great but at 40-45mph the rumble in the car was terrible I got this and put them in my tubes (they go deep but stop in the right place), attached them with screws and made NO MORE DRONE, but the car became very quiet, after that I took them out and played with a bit of them, I drilled the existing ones where the holes are bigger without affecting the structure, installed the back plate in the last place and again used and it was great, i have the great sound i had before and NO MORE DRONES now i can enjoy the car, they are not very thick and only time will tell how well they hold up but now that they work, I can easily replace them with the same or a similar product. I hope this helps my fellow riders tsam.
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