Former world boxing champion Naseem Hamed is to be freed from jail 16 weeks into a 15-month sentence.
Hamed was jailed for 15 months on 12 May
Hamed, 32, admitted dangerous driving following an horrific high-speed crash in his £320,000 Mercedes McLaren.
The head-on crash left another man with fractures to "every major bone in his body", the court heard.
Prison sources confirmed he will be freed on an electronic tag next week under the Home Office's home detention curfew scheme.
Sheffield Crown Court heard the former world featherweight champion took a "stupid risk" while showing off his powerful sports car to a businessman and fellow motoring enthusiast.
Hamed, of Wyvern Gardens, Dore, Sheffield, was doing at least 90mph on the wrong side of the carriageway as he approached a blind dip on Ringinglow Road, on the edge of the Peak District, in May 2005.
The carbon fibre supercar, with the registration plate NAS 1, was in a head-on collision with a Volkswagen Golf, driven by 38-year-old Anthony Burgin.
Mr Burgin's vehicle was immediately stopped and propelled backwards by the impact.
His wife Clare was also seriously hurt in the collision.
Immediately after Hamed's sentencing, the Burgins' solicitor Jane Wright said her clients were "extremely relieved" at the sentence and hoped it would make other people "realise the dangers inherent in speeding".
A Prison Service spokeswoman said: "Home Detention Curfew provides suitable low risk prisoners with a smoother and more effective re-integration back into the community."
In a statement, Mr Burgin expressed his shock at the decision to grant Hamed early release.
"What happened to my wife and I was deeply distressing and nearly destroyed our lives," he said.
"I am shocked that after such a serious accident Mr Hamed has been released after less than four months."