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I've only obtain me 1/18 ferrari f60 and consider the back to begin to see the difuser.. Appears like double.. after some investigations online I then found out some dual diffusers of the late ferrari f60 and also some from Bahrain.. but i can't see much difference on which may be the increase and whats the single.. May some one show me please? Visit this site: http://i44.tinypic.com/mbsn7m.jpg The very first pix is from bahrain.this is simple? whats the primary huge difference to the double?whats precisely double??