Robert Peov had planned to sell his Nissan Skyline sports car to pay for his wedding next month.
However, the 21-year-old P-plate driver, from Chester Hill, died behind the wheel on Monday night. His fiancee, Joanna Mourani, 20, a front-seat passenger, also died.
The driver's 17-year-old brother, travelling in the back seat, suffered severe head injuries and last night remained in a critical condition in Liverpool Hospital.
The crash follows a similar incident on the Central Coast last month in which three teenagers were killed in a Nissan Skyline driven by a P-plater, and comes during intense political debate about the dangers associated with P-plate drivers.
Police said yesterday Mr Peov and Ms Mourani were crushed in the car after it clipped the front of a four-wheel-drive on Milperra Road, Milperra and rammed into a power pole.
The collision was so forceful it tore the car into pieces and scattered debris over more than 50 metres.
Witnesses told police the car was travelling "at extreme speed" alongside another speeding car in the 70kmh, two-lane zone.
"I can't say nothing because they both were more than words," Ms Mourani's brother, George, told Channel Seven through tears last night.
The Metropolitan Crash Investigation Unit commander, Senior Sergeant Peter Jenkins, said the crash scene was one of the worst in recent years.
"It was a scene of total devastation," he said. "We have a vehicle that has been torn in pieces. I don't know if words can put it into a proper description."
Police are still looking for the driver of the second car, a silver vehicle similar in make to Mr Peov's Nissan Skyline.
They believe the driver was racing with Mr Peov when the crash occurred, at the corner of Marigold Street.
But Mr Peov's sister, Sambo, rejected the possibility.
"I've been in the car with him - he's not that stupid," she said.
The 42-year-old driver of the four-wheel-drive, who was attempting to turn off the M4 ahead of the two cars, was treated for minor injuries then released from hospital.
Inexperienced drivers in Victoria and NSW will trial a P-plate training course which could be made mandatory, at a cost of $100 million, by 2007.
If the scheme works, it could be introduced nationally.
The course will include classroom discussion, one-on-one and demonstration driving.
NSW drivers holding the first stage of a P licence will also be banned under the law from driving V8-powered, super-charged and turbo-charged vehicles.
As well, young drivers will be restricted from carrying multiple passengers if they lose their licence.
"They believe the driver was racing with Mr Peov when the crash occurred, at the corner of Marigold Street.
But Mr Peov's sister, Sambo, rejected the possibility. "I've been in the car with him - he's not that stupid," she said."
Bull shit. There's only one reason he ended up in a telegraph pole. I don't know why this sort of thing has me in a knot, it just does.