Yes, there are simple "audio upgrade" plug in modules for Tesla available.
But why would more speakers make what you're listening to sound better?
No matter what you're into, be it The Beatles, Miley, Tiesto or Roger Whitaker, they won't sound any better coming through more of the basic Tesla built-in factory speakers.
17 speakers isn't all that helpful when you've still only got two ears.
Will adding more windows to your Tesla change the scenery outside?
OR - are you just seeing the exact same scenery through more windows made with the same glass?
More speakers doesn't automatically make it better, just the same sound in more places.
Don't let the fact you can't change the factory stereo be a deterrant. We can still adjust every part of the sound based on the type of songs you listen to, even if you love a good country and western rap metal fusion.
Everything looks the same, no holes cut or visible changes, and everything can be reverted back to factory when you sell.
Need a little more bass, or a LOT more bass, clear vocals or brighter crispness? Maybe a little of each? Whatever is most important to you about the sound inside your Tesla, we can make it better.
Depending on which system you choose, the simple fact alone that YOU have control over it makes it better than factory.
Instead of a factory system sounding "good to everyone", we can adjust everything about your new system instead. The type of speakers and subwoofer, the size of subwoofer, the processor, the amount of power in the amplifier, how the fully adjustable EQ (up to 31 bands) is set, all play a part in how the system will sound.
Clarity. Seamless Control. Invisible.
While we can make it louder, that doesn't automatically mean it's better.
Better is better.
But louder AND better is still an option as well.