The Portfolio, a version of XKR developed by Jaguar's Special Vehicles team and Alcon. It includes 400 mm diameter front and 350 mm rear discs, six-piston front callipers and four-piston rear callipers, 20-inch five-spoke Cremona wheels, Power Vents, Shadow Grey Paint, Satin American Walnut veneer, alloy and leather gearshift selector, soft-grab door handles, contrast stitching throughout the cabin, leather-edged mats with a Jaguar logo, Portfolio treadplates on the doorsills, 525 W Premium Audio system with Dolby Pro Logic II surround sound system by Bowers &.