While the sound system in your Model 3 is not horrible, its also not great. We have solved this issue by putting together an affordable solution that solves the problem. Starting off with a hidden Mosconi EQ Processor that allows us to interface safely into the Tesla audio system, add amplification and when we are finished we can EQ the system to suit all your music needs. We then upgrade the speakers using Focal Flax Series three-way components in the front and Focal. A custom fabricated enclosure with a 10" Focal Auditor subwoofer that can either be exposed in the trunk or hidden in the floor cubby area is installed. The system is powered by a Mosconi 600 watt digital amplifier. This system takes 5 days for installation and the cost is $4,500.