When we got our new car, I noticed a vibration and shake @ 1800-1900 rpm. I called the dealer and he said it was an exhaust drone and was normal. As you know the exhaust is the most restrictive i've ever seen so to satisfy my curiosity i had the local muffler shop cut off the "silencer" aka #2 muffler and put in a free flowing 3" after market exhaust tip. The drone is gone and the car seems to feel a little less restricted. The sound is suprising too! It's still quiet on the inside but when you are behind it you can hear that dodge v8 grumble.

 

I put duals on mine and what great sound, inside and out.