According to Official Guinness Records,
The fastest 360° flip of a car by a team is 5.25 seconds and was achieved by Jervis Manupenu, Jonny Mirza and Pete Hill (all UK) on the set of Guinness World Records Smashed at Pinewood Studios, UK, on 15 April 2009. All three are members of the Bracknell rugby team. They competed agains three wrestlers.
For a complete list of 2009 records, please visit 2009 Guinness Records in United Kingdom.