Two people are on the run after a brazen carjacking at Rutherford.

Police say around 6.10am on Sunday, a man left his Mercedes Benz 4WD in the driveway of a business on Racecourse Road, when a woman got into the vehicle.

As he was trying to remove her, a man approached with a gun and ordered him to leave the car.

The woman then drove off and the man left in a Nissan Skyline.

The stolen Mercedes is a 2012 model, silver in colour with the NSW registration ETZ-43F.

The Skyline is a 1990 model, white in colour with the NS registration EOW-76F.

Police are urging anyone who spots the vehicles not to approach but the call Triple Zero immediately.