I am not sure when they started using the Carbon nanotube technology on the SLX. I have the 2010 with the ITT. I had a choice between a 2009 and a 2010 for a little more. I had heard of some issues with the old plug design so I went with the newer design. I think that is the only significant difference, unless htey went to the nanotube carbon between 07 and 10.