Iran has started installing “6000 new centrifuges” at the Natanz enrichment plant, President Mahmud Ahmadinejad announced after visiting the nuclear enrichment facility on Tuesday.... In his address at the meeting, the president said the testing of the new advanced centrifuges, which can enrich uranium five times faster than the current machines, will be finished in the next three months.
Source"Iran starts installing 6000 new centrifuges" 9 April 2008. Tehran Times. http://www.tehrantimes.com/index_View.asp?code=165793