The Audi A8 built on the Volkswagen Group D3 platform was introduced in late 2003. The model was longer than the previous generation, with room for four or five large adult occupants in the cabin, depending on rear seat configuration. As with the previous version, two body variants of the second generation Audi A8 are offered, the A8 (standard, or short wheelbase), and the long-wheelbase (LWB) A8L. The A8L adds 5 inches (127 mm) to the rear legroom and 11 mm (0.43 in) to the overall height of the car. Audi restyled the D3 platform A8 range slightly in 2005, endowing all variants with a taller, wider trapezoidal single-frame grille, inspired by that of the Nuvolari quattro concept car. The top-of-the-line W12 engined W12 version was the first model to be equipped with this grille; V8 engined models were fitted with the new grille the following year. In addition to the styling update, new internal combustion engines became available to European and Asian market customers. The entry-level Audi A8 3.0 litre V6 engine was replaced with a new 3.2 litre unit featuring Fuel Stratified Injection , which it shares with the B7 Audi A4. This generation Audi A8 introduced the 321 PS 4.2 litre V8 TDI - the most powerful diesel engine Audi has ever offered in a passenger automobile, before the debut of Audi's 6.0 litre V12 TDI engine in the Audi Q7. The engine uses two turbochargers and two intercoolers, with each turbocharger functioning exclusively for one bank of four cylinders. The 2.8 litre V6 FSI, which is recently added to the Audi A8 range, has a class leading 199g/km of CO2 emission.