Microsoft's car racing game, Project Gotham Racing 3 on the Xbox 360 got a speed boost this week.

From today gamers will be able to download the PGR 3 Speed Pack that features 12 new cars including the Ferrari 612 and the Aston Martin V8 Vantage.

The Speed Pack also offers the added ability for hosts to take players to the lobby during playtime races, new Xbox Live Achievements, rotating car classes for Career Championships, Gamertags displayed during in-game conversation, saveable custom routes once raced over Xbox Live and additional online and offline enhancements.

The twelve new cars include: Audi RS 4, Chevrolet Corvette Z06, Dodge Viper SRT-10 Coupe, Lamborghini Gallardo SE, Mitsubishi Lancer Evolution VIII FQ-400, Nissan NISMO R34GT-R Z-Tune, Pontiac GTO, Radical SR8, RUF RT12, Saleen S7 Twin Turbo, Ferrari 612 Scaglietti and the Aston Martin V8 Vantage.

The Speed Pack will debut for a total of 400 Microsoft Points (around £3.50), though gamers can also choose to purchase the vehicles a la carte for a nominal fee.