All new for 2005, the Jaguar XJ Super V8 is a unique combination of bits and pieces from existing XJ models, with a few additional creature comforts thrown in as standard equipment.

Even casual observers will notice the Super V8’s stretched wheelbase, measuring 124.4 inches and shared with both the XJ8L and Vanden Plas models. The body on these versions is also five inches longer than the XJ8 and XJR models, adds 0.3 inches of extra height, and offers another two feet of passenger volume. Unique to the 2005 Jaguar Super V8’s exterior are headlight washers, front parking sensors, and a chrome mesh grille. Available colors include Racing Green, Platinum Silver, Ebony, and Radiance Metallic.

What is less obvious is the monster that lies below the bonnet, though the subtle exterior badges are a strong hint. A supercharged 4.2-liter V8 pushes out 390 horsepower at 6,100 rpm and an earth-quaking 399 lb.-ft. of torque at 3,500 rpm, 96 more horses and 96 more lb.-ft. of torque than the non-supercharged motor powering the XJ8, XJ8L, and Vanden Plas. This deep breathing eight-cylinder powerplant also powers the Jaguar XJR and features an aluminum block and cylinder heads, 32 valves, and dual overhead cams. It’s all connected to a six-speed manually interactive automatic transmission topped off with Jag’s often-maligned J-gate shifter.

Though the powertrain is shared with the performance-oriented XJR, the independent double wishbone suspension with automatic load leveling is tuned for a more comfortable ride, similar to the XJ8 and Vanden Plas models, though a 17-mm rear stabilizer bar is borrowed from the XJR. Same goes for the Brembo brakes, with 366-mm vented discs up front and 330-mm solid discs in the rear. Unique 19-inch alloy wheels meet the road through P255/40R19 Z-rated performance tires.

Interior components have also been picked from the 2005 Jaguar XJ standard parts bin, with a few notable exceptions. Special attention has been paid to the Super V8’s rear seat passengers, lucky souls who will enjoy manual sunshades on the doors, power headrests, and a heated bench seat with six power adjustments. The front passenger seat has a power button that allows a rider in back to move the seat forward, providing maximum rear comfort (though the front passenger may not be too thrilled). And the cherry on top is the rear DVD system, with twin 6.5-inch screens in the backs of the front headrests, sound controls and audio jacks located in the fold-down center armrest, and a trunk-mounted DVD player. Front-seat passengers get a DVD- and GPS-based navigation system with a seven-inch screen mounted in the center dash.

Among the standard features shared with other XJ models are three-position memory settings for the power tilt and telescoping steering wheel, foot pedals, exterior mirrors, and 16-way adjustable driver’s seat that wears the Vanden Plas model’s upgraded leather. Also shared with the Jaguar XJ Vanden Plas are lambswool floor mats, front seatback fold-down trays, and added Burl Walnut trim. Safety features include traction and stability control systems, intelligent cruise control, electronic brake assistance, front dual airbags, front side airbags, and side curtain airbags.