Hello all. Brand new to this forum. Yesterday I bought a brand new 2020 Challenger Hellcat Redeye Widebody. I’ve only put about 200 miles on it, driving it as recommended until the 300 mile break in. I noticed after probably the first 30 miles, and constantly since, there is a noise that sounds like a knocking or exhaust leak/vibration. You can hear it loud with the windows up at idle. Almost like a resonating thump/knock. Sounds like it is coming from under the passenger seat or even further back. Its not the “hemi tick” sorta sound either. You cannot hear it outside the vehicle at all. Even next to a wall, under the hood, under the fender welds, laying under the car, etc. Only inside the vehicle at idle. Goes away above idle speed. Any thoughts guys? Thanks in advance.