A 23-year-old from Tenby has been found guilty of causing death by dangerous driving whilst on a test drive on a country road in Pembrokeshire.
Nathan Morris, aged 24, was told he would serve a substantial prison sentence.
Morris had taken Gavin Collier, aged 20, for a test run in his Peugeot 106 Rallye when he lost control while driving at up to 75 mph.
The Rallye slid sideways into a parked Isuzu Trooper which was knocked 17 metres and reached 24 mph.
Mr Collier, a front seat passenger, was killed instantly and Morris was airlifted to hospital with a punctured lung.
Morris, of Heywood Court, Tenby, west Wales, had admitted causing death by careless driving but denied the more serious charge.
But he was convicted unanimously by a jury at Swansea crown court.
After the verdict Judge John Diehl was told that Morris, a mechanical engineering student, had previous convictions for driving while above the alcohol limit and drunk and disorderly behaviour.
Judge Diehl said he would be sentenced after 11 February and after a probation officer had prepared a report into his background.
But he warned Morris to be realistic and to prepare himself for a substantial prison sentence.
His driving, he added, had had catastrophic consequences. Morris has already been banned from driving.
After the case, Mr Collier’s family issued a statement saying, “Gavin’s father, family and friends have been devastated by his tragic and untimely death.
“Gavin loved life but had his whole future cruelly snatched away from him by the reckless and irresponsible actions of Nathan Morris.
“While nothing will ever bring Gavin back his family hopes his death has not been entirely in vain and will act as a warning to others of the tragic consequences that can result from dangerous and irresponsible driving.”