According to Official Guinness Records,
The highest score for FIFA street was achieved by Andrew Mee (UK) on 7 August 2006. He scored 222,774 points on the Xbox version of FIFA street. Playing on the Easy setting, Mee achieved this total while playing a 12 minute game.Andrew's brother, Jonathan Mee, holds the record for the highest margin of victory in FIFA Street (Xbox). On 8 June 2007, he beat his computer opponent (set to the Easy setting) by a 22 goal margin in a 12 minute match.
For a complete list of 2006 records, please visit 2006 Guinness Records in United Kingdom.