I'm a huge Jan Hammer/Miami Vice fan. He has mentioned in several interviews that the random arpeggiator part and the strings are both the Jupiter-8. The percussion sounds are probably samples triggered through his Fairlight (Jan used the Fairlight for sampling and for sequencing). I'm not sure what the xylophone like sound in the lead is during the beginning and end of the track. The breathy sounding layer in the lead is either the "arr1" Fairlight sample or a patch on the Jupiter-8 (I say that it could be the Jupiter-8 because I have a Roland JD-990 with a patch called "heavenhollow" that sounds EXACTLY like that sound...possibly it is a copy of a Jupiter-8 patch...?) The screaming lead guitar is a signature Jan Hammer sound. It is probably either the Yamaha DX7 or his Memorymoog run through various effects.
Whenever I hit D-C-A-F-G-F-G on my keyboard I get chills up my spine.
Be sure to visit www.janhammer.com to purchase Miami Vice: The Complete Collection. Although the collection is far from "complete" it is a superb set of Miami Vice stuff.