Police have told an Adelaide court they may need to recreate a prankster's stunt, which would involve filling a car with water to test how it handles on the road, to prove it was dangerous.

Key points: Michael Philippou is charged with dangerous driving, driving an unregistered vehicle and failing to wear a seatbelt

Michael Philippou is charged with dangerous driving, driving an unregistered vehicle and failing to wear a seatbelt The charges come after the prankster drove a water-filled car to a bottle shop in January 2019

The charges come after the prankster drove a water-filled car to a bottle shop in January 2019 His twin brother Danny has offered to help police recreate the stunt

Michael Philippou, 27, is facing several charges after filling up a car with water and driving it to a bottle shop during a heatwave in January 2019.

Mr Philippou and his twin brother Danny, known as 'RackaRacka' on social media, uploaded a video of the 'scuba driving' stunt to YouTube, where it attracted millions of views.

On Friday in the Christies Beach Magistrates Court, the police prosecutor said more evidence may be needed to prove the stunt could be considered driving in a reckless or dangerous manner without due care.

Michael Philippou in the front seat of the car after it had been filled with water. ( YouTube )

He said they may need to fill another car with water so an expert could test how the weight of the water affects a vehicle's handling on the road.

The prankster's lawyer indicated they may apply to vary his client's bail so he can travel to the United States to advance a number of film projects.

Pranksters volunteer to assist police testing

Outside court, supporters of Philippou — including a man dressed as Batman and another with the word "innocent" painted on his bare chest — rallied around their friend.

Danny Philippou volunteered to assist the police.

The RackaRacka twins speak to the media outside court. ( ABC News )

"They're going to reconstruct the car with taxpayers' money," he said.

"I'd like to put my hand forward to drive the car — someone needs to test it."

Michael Philippou was asked outside court about the serious nature of the charges, which include driving an unregistered and uninsured vehicle, and failing to wear a seatbelt.

"I was possessed by the devil, there's nothing I can do about it," he said.

"If [police] are going to make an underwater car, we've got an underwater car, maybe we can have an underwater car race and see who gets to the bottle shop first."

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The case has been adjourned until April.

The brothers have acquired a cult following since shooting to fame in 2014 with a Harry Potter versus Star Wars clip.

They have made it into a top 10 list of Australia's most influential cultural people, in the Australian Financial Review, and were named in Variety magazine's list of top "Famechangers".

RackaRacka's early YouTube clips were made at their father's house at suburban Pooraka, north of Adelaide.