Alsaadoun, previously of Lilestone Street,Marylebone, appealed the sentence, claiming it was excessive.
However, in May this year appeal judges upheld the sentence.
At around 3.15am on June 13, 2022, the BMW approached the Westway, an elevated dual carriageway section of the A40, while travelling at 46mph.
But in just over half a minute Alsaadoun accelerated to 90mph on the 30mph stretch of road, prosecutor Lisa Goddard told the court.
Alsaadoun had been renting the BMW for almost a month at the cost of £300 a fortnight.
Judge Anthony Leonard KC said: “There can only be one purpose for having a car with that amount of power when you were 21, and that’s for the speed you can obtain.”
Yusif’s family said he had always feared going fast and always avoided rollercoasters for this reason.
But even though Yusif would not have been interested in going fast, Judge Leonard said Alsaadoun wanted to show off the power of the car.
It was not clear to investigators why the BMW was straddling two lanes when the crash happened, prosecutor Ms Goddard said.
The lorry driver described the horror of the aftermath, as Alsadooun got out of the wrecked car shouting “my cousin, my cousin”.
Alsaadoun then took his phone out and called his parents, who lived just a 30-second walk away, rather than 999.
When police arrived Alsaadoun appeared to be in a state of shock and begged officers “please help him”.
Despite the efforts of paramedics and ambulance staff, Yusif was pronounced dead at the scene.
Alsaadoun was arrested before being taken to hospital where scans and X-rays showed he had no serious injuries.
He later answered no comments to all questions in a police interview, other than to issue a prepared statement saying the BMW was not stolen and that he was insured to drive it.
The Old Bailey heard Yusif was a quiet and caring young man with a pure heart and soul.
He was planning to start a plumbing course and regularly helped with his father’s family business.
“He was everything to me. Yusif and I were very close and spent lots of time together. I love him and will always love him and miss him very much,” Yusif’s sister said.
Yusif’s mum said: “I do not know what the purpose of life is anymore. I have withdrawn from the world, this is because I have lost everything.”
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Judge Leonard explained that this crash happened just weeks before new guidelines were introduced that raise the maximum sentence for this offence from 14 years to life.
“The family must understand that the sentence I pass cannot and will not make up for the loss of Yusif’s life,” Judge Leonard said.
Alsaadoun had previously been disqualified for one year for driving with excess cannabis in his system and on another occasion he had been fined for driving without insurance.
Judge Leonard explained that after hearing all the evidence, he was satisfied that Alsaadoun had been travelling at 90mph to show off.
“Given that this happened within walking distance of your home, I conclude that you went up on the three-lane road to show off the speed of the car,” Judge Leonard said.
He added that the only reason for a 21-year-old apprentice to rent such a powerful car would be to show off.
Judge Leonard sentenced Alsaadoun to eight years and four months in prison.
He was also banned from driving for ten years and two months, and will be required to pass an extended driving test before he can drive again.
