Could be the AC drain is clogged. If clogged water from heavy rain can build up in the fresh air intake portion and spill over in the car, it all is located in the passenger side foot well. And it could be a blocked sunroof drain as well as Catless suggested.My husband has a 2016 Hellcat. Today we got into it for the first time in about 4days of heavy heavy rain. Lucky us. I found the passenger side carpet soaked with water. At first we thought heater core. But it’s honestly to much water for that. And the carpet under the dash is not wet. Still have heat. And the water is not coolant. Anyone have any issues with sunroof drain? Or windshield seals?? Car has 53,000 on it. Does have a sunroof. There is no obvious source of the water.