Judge Walsh blamed speed, immaturity and inattention for the crash.
"You will be haunted for the rest of their life," he told Boustridge.
"This accident really came about with a moment's inattention with you at the wheel of a car."
Boustridge's mother, grandfather and sister were in court to support him.
The court was told police had stopped Boustridge driving the Subaru Legacy at Culverden two days before the crash.
They had suspended his learner's licence because he had excess demerit points for driving while unaccompanied.
About 4pm on March 2, Boustridge and four friends drove to Tauranga Bay for a swim. The road had a 100km/h speed limit.
Boustridge was putting his cell phone charger back in the socket when the car failed to take a sweeping right hand bend.
Police estimated the Subaru was travelling at about 120km/h as it entered the bend and about 113km/h when Boustridge lost control.
The car slid off the road, across the grass verge, through scrub and stopped on its side down a bank.
Mr O'Donnell died at the scene. One passenger sustained a badly broken leg and another a broken foot.
The car's registration had expired but it had a current warrant of fitness.
Boustridge's lawyer, Doug Taffs, said his client had immediately admitted blame for the crash. He had offered to identify Mr O'Donnell's body to spare the O'Donnell family more heartache.
Mr Taffs said none of the victims had wanted to take part in restorative justice. A local constable had represented Mr O'Donnell's family.
The officer was impressed by Boustridge's remorse, acceptance of responsibility, and knowledge he must face censure.
Boustridge hoped to start limited service volunteer training next month. It would hopefully allow him to pursue a career in the armed services, Mr Taffs said.
Judge Walsh said Boustridge had never been in court before. Mr O'Donnell's parents had made it clear they did not want him jailed and did not blame him for their son's death.
The judge accepted that Boustridge was genuinely remorseful and had been a sincere and active participant in restorative justice.
He read from a letter from Boustridge's mother who said her son had been a normal, happy teen with a bright future. He had achieved NCEA and had never been in trouble before.
"Dylan made some bad choices that week that had tragic consequences. A family has been destroyed and so many people's lives will never be the same again," the letter said.
Judge Walsh also read excerpts from a letter written by Mr O'Donnell's mother.
"Some days are better than others but generally I'm sad all the time?" she said.
"I'm glad Dylan has taken responsibility for the crash. I feel a little sorry for him because he has to live with it for the rest of his life."
