I have a new, never installed Light Harmonics S12P Premium Amplifier (While you drive the world’s best electric vehicle, you should be listening to the world’s best stereo.) for sale. I was going to put it in my 2012, but never ended up doing so and I'm probably selling it sooner rather than later, so I'm not going to bother putting it in. I have one in my 2015 and it makes nice difference in the sound inside the Tesla for UHFS systems. Asking $750 + shipping, that's $200 off the current price from Light Harmonics directly. PM if interested.