Admire the muscle car — but don’t touch it.

Two Brooklyn men were beaten up outside MetLife Stadium in New Jersey as they gawked and put their hands on a classic low-rider Chevy Impala Sunday.

Alfredo Lopez, 37, and Raymundo Lopez, 35, asked the car’s driver to use its hydraulic system to “bounce” it up and down.

Unfortunately, the Bushwick residents made the mistake of tapping on the car’s body, said State Police Sgt. Brian Polite.

“After they touched the car, there was an altercation,” Polite said.

Five or six men inside the vehicle attacked the pair. They hit Alfredo Lopez in the head with a bottle, and punched and beat him.

Alfredo Lopez was in critical but stable condition at Hackensack University Medical Center yesterday, Polite said. Raymundo Lopez was treated and released.