Mike's item #3 would be the killer for me - the 987's can be scanned for 5 levels of overrev (ignitions), while the 986 can only be scanned for 2 levels.
Any indi who does the PPI can print off the overrev picture - if the car's DME has registered level 2 and above, I think Porsche will invalidate any warranty anyway.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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