Like a hot rod
 

Hey everyone. New hear so forgive me if this has been discussed. I just wondered if anyone had a clue what could be going on, what I'm going to have to pay for the following:
Went to my VA appointment which was about a 3 hour round trip drive. my 300 base drove perfectly, as I had just got some new Goodyears put on the day before at the Sams Club.
Came back from the VA, decided to drive about another 30 minutes to Walmart and thats when the perfection dis a Freakin peared!!! My chrysler 300-out of NO where- started sounding like one of those little hot rod cars in the Fast and Furious movies. Had my windows up when it occurred and man the sound was so loud in the car which is what really made me notice it. I got of the gas and as I slowed down, the car sounded like it was even DOWN shifting with the loud rumbling noise too. I kid you not it was like I had got it modified with loud pipes or something....???? WTF man???