Works of art with a purpose.

The team at iXoost produce some of the nicest speakers in the game, mostly due to the fact that they're made them from repurposed Formula 1 race car exhausts. The entry-level options start around $5,600 each and they also do custom commissions if you have a particular ride, F1 or not, that you want to pump some tunes out of. 

(Source: Classic Driver)