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I believe that ACC was standard equipment on North American XKR models only in 2008 and 2010, and optional in all other years.
Did you mean all North American XKR's because my copy of the 2008 US brochure still shows it as optional so I think 2010 was the only year it was standard?
And I hate to say it but the Press Release for the 2008 US models specifically list it as a $2,200 option on the Portfolio as well:
My mistake; I stand corrected. I confused the Adaptive Cruise Control with the Alcon Performance Brake Package.
The 2008 XKR Portfolio came with the Alcon Performance Brake Package as standard equipment. Front rotors are 400mm crescent- grooved discs with red 6-piston calipers with cast raised //R logo. Rears are 350mm crescent- grooved discs with red 4-piston calipers. At the time, they were the largest brakes ever fitted to a production Jaguar.
Alcons were a $5,000 option on the 2009 XKR Portfolio models.
The Alcon Performance Brake Package was available only for 2008 and 2009. It was not available for any 5.0L models.