Last month's delivery of DLC vehicles to Forza 4 may not have been enough for you. It was lacking something, perhaps? A certain whiff of editorial sponsorship? This month's pack should have you more than covered, with gaming site IGN teaming up with game developer Turn 10 and publisher Microsoft to release the "December IGN pack." Suddenly "November Speed Pack" sounds much more exciting than it did last month, eh?

Like November's DLC pack, this month's will come with 10 cars from across the automotive spectrum, from a modded, modern Mazda RX-8, to a not-so-modded (or modern) Alfa Romeo Spider Quadrifoglio Verde. We'll let you guess which one of those goes faster! Also like November's pack, this one is gratis should you already own the game's $30 "Season Pass," or 560 MS Points ($7) otherwise.

Head past the break for a full list of the cars.