I purchased the new upgraded SST system from Custom Autosound and mounted it under the dash below the steering column. It is not visible. I then put a Dual Voice Cone speaker under the dash. It fits the opening from the original center dash speaker. Then I mounted two Undercover II subwoofer/tweeter speakers "in" the back rest of the back seat. Gives "good vibrations" for any passengers but you cannot feel it in the back rest.

Controler for the system fits in the console storage.

Plenty of sound. Of course at 60mph with top down it has to be turned up pretty loud.

I left the original radio in the dash but disconnected.