Bono's Benz is no bull.

U2 singer Bono was the first owner of this 1980 Mercedes-Benz 450 SEL. (Car & Classic)

A custom 1980 Mercedes-Benz 450 SEL once-owned by the U2 singer is being auctioned on July 18.

The silver, right-hand-drive sedan that Bono purchased to celebrate the success of U2's first album looks subdued on the outside, but things are very different when you open it up.

(Car & Classic)

The four-door luxury car is equipped with an Alpine audio system befitting a rock star that includes multiple speakers in each door and several amps in the trunk that cost 12,000 British pounds, which is the equivalent of $65,000 today.

(Car & Classic)

The setup is so powerful (or sketchy) that a fire extinguisher was installed on the center console just in case it overheated. The listing cautions that it is currently suffering from a fault.

(Car & Classic)

But the car's most eye-catching feature is the brown cowhide upholstery that covers the seats and several panels, which was definitely not a factory option.

(Tim Mosenfelder/Getty Images)

The auctioneer, Car & Classic, hasn't confirmed that Bono was the one that ordered the unusual interior design, but it sure seems like something a rock star with a penchant for cowboy hats would do.

According to the Hagerty Price Guide, a car like this in perfect condition is worth around $28,000, but Bono's has 163,000 miles on the odometer and was, well, owned by Bono, so there's no telling what it might sell for.