Manifold/header/muffler/tail Pipe problems of the 2016 Volkswagen Jetta

2016 Jetta se1. 4 new for 18 year old son for college. Within a week car was in the shop with electrical issues for lighter and usb shorting out phone + radar while the car was driving. No issue found we drove 1000+miles to school, center console would blink on and off during the trip. New dealer also did not find any issues. Car then started shutting off while driving under 5 mph in traffic in nyc. When coming out of the driveway the rear view camera turned off, the car turned off. Vw was called they had him turn off the power by holding the pushbutton and break which restarted the car. New dealer still no issue found. The car continues to loose power all except auxiliary several incidents very unsafe. Was going up a hill and the car shifted into neutral and started rolling back, applied the handbreak the back wheels locked and the car stopped thankfully it was at night and no traffic. Two days later at jfk in the arrival line the car shut off while creeping forward. Took it to another new dealer they kept the car for one week, no issue found. Issues conitued now including slipping out of gear revving to 8000rpm, having to push far down for the break to engage. All the lights turn off while driving intermittently very unsafe. Took it to new dealer they found no issue I refused to pick it up and called vw corp they had them drive the car for 50 miles finally an error message. They replaced the transmission cylinoid. It is still having issues. The car overheated and the electrical stopped working. He smelled the coolant threw the vents he was about to pull over when the car reved to 8000 rpm and dropped out of gear so he pulled over and slowed down the lights and radio turned off. When he looked the exhaust manifold was glowing red. The car took an hr to cool down and electrical to come back. Back to the dealer again no issues again called vw corp for complaint.