On Entourage, not many things get under the skin of Ari Gold.

But when it comes to his archrival Adam Davies, it might as well be a flesh-eating fungus.

Things come to a head tonight as the hot-blooded agent and his former employee battle it out behind the wheel.

“There’s an incident and a wager is made,” Jordan Belfi, who plays Adam, tells the TV Fanatic.

“Ari is in new Ferrari, I’m in a Porsche 911 and we’re drag racing down the strip. It’s out of control,” he continues, adding that the evening ends in “a physical climax.”

Ari should know better! No one makes him want to break things the way Davies does.

“Adam is one of the characters on the show that really knows how to get under Ari’s skin and push his buttons, to the point where he flips out at the end of this episode,” Jordan says.

Hmmm, that could be a real-life scary proposition. After all, Ari is played intensely by outspoken actor Jeremy Pivens.

“Jeremy, like Ari, is a force to be reckoned with,” Jordan concedes.

 He reassures us that anything truly volatile is saved for the camera.

“We’re sort of like friends in a professional capacity and joke around offset.  And then we turn it on once it’s time to turn it on.”

I'm pretty certain that's the only way Jeremy would have it.

Entourage airs Sunday, Sept. 21 at 10 p.m. on HBO.