Check out T Sportline's subwoofer and amp upgrade. They provide a dual voice coil sub driver with a beefy magnet and a 300 watt (150 w/ch since it's a dual voice coil driver) amplifier. Install looks fairly straightforward. One thing I'd do differently is to line the plastic sub box with some Dynamat to deaden the enclosure.
Tesla Model 3 / Y Audiophile Upgraded Sound System Speakers Subwoofer & Amplifier
Tesla Model 3 / Y Audiophile Upgraded Sound System Speakers Subwoofer & Amplifier