Jason Zibarras, 50, was “impatient” to show his son how fast his £80,000 car could go when he overtook on double white lines on the crest of a hill.
He accelerated from 48mph to 84mph to race past two cars on the A3400 near Chipping Norton, Oxon., on January 26 last year.
Moments after passing the second car, he ploughed into a Volvo v50 and a Renault Capture which were travelling in the opposite direction.
Volvo driver Steven Askew, 35, who was driving home with his 10-month-old son, was rushed to hospital with multiple injuries.
He suffered a broken collarbone, shin, arm, foot, and had two bleeds on his brain and spent weeks recovering in hospital.
His life-changing injuries have left the new dad with mobility problems and memory loss.
Zibarras, of Oxford Road, Enstone, Oxon., was charged by postal requisition on May 31 and he admitted causing serious injury by dangerous driving on July 24.
He was jailed for 18 months and banned from driving for three years at Oxford Crown Court on Friday (22/12).
Sentencing Zibarras, Judge John Bate-Williams told him: “It was not a mistake.
“It was a bad mistake, a very bad mistake. Mr Askew has suffered devastating effects on his life.
“It was born out of, in my view, your impatience and your desire to show the speed of your new car to your son.”
The court heard Mr Askew had celebrated his baby son’s first Christmas in the new home he’d bought with his wife just weeks before the crash.
Speaking at court, Mr Askew said: “A lot of doctors told me I was lucky to be here which is terrifying.
“My son could have been left without a father and my wife would have been left alone, struggling to cope.”
He added he was unable to remember anything from two weeks before or after the crash.
He said: “I was dismissed from the hospital just in time to see my son walk for the first time and to celebrate his first birthday.
“I’m now struggling with what feels like a slower mind and have short-term memory issues.”
Data from the Porsche showed Zibarras accelerated from 48mph to 84mph in just five seconds moments before smashing into Mr Askew.
The court heard the double white lines were worn and it was dark when he overtook at 5.23pm.
Prosecutor Nigel Ogbourne said the dad-of-three was familiar with the road and “must have known” not to overtake.
Richard Dawson, defending, said: “This is plainly a tragic case with catastrophic consequences.
“Mr Zibarras is deeply ashamed.
“There really is no sentence this court can impose that would be a greater punishment than the torment he already places on himself.”
Investigating officer PC Mark Jones, of the Joint Operations Roads Policing Unit at Thames Valley Police, said: “The victims’ lives and those of their families have been tipped upside down due to Jason Zibarras deciding to drive so dangerously.
“I would like to thank all the witnesses who have assisted this investigation and who are still affected by what they encountered at the scene.
“I hope this sentence serves as a reminder to people who chose to drive in such a manner that there are consequences not only for them but for others too.”
