A man is on the run after police chased down a suspected "kill car", seizing a loaded shotgun and jerry cans.

The black SUV sped away from police and sparked a pursuit through the streets of Western Sydney on Monday afternoon, reaching speeds of up to 80km/h in 50km/h streets before hitting a parked car in Merrylands West.

Four people wearing balaclavas ran from the vehicle.

Though three were quickly arrested, the fourth remains on the run.

After searching their SUV, police found it had been stolen from Balwyn in Victoria, about 850km away.

They also uncovered a loaded shotgun under the driver's seat and two jerry cans in the back.

The SUV bears many hallmarks of a "kill car", which are generally used by organised crime and contract criminals to commit and get away with serious offen

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