A 1965 Pontiac GTO, '69 Shelby GT500 428CJ, '71 Plymouth GTX 426 Hemi, '70 Buick GSX. They're all in your dad's fantasy garage, and they're among the cars included in a free DLC pack Forza 4 Season Pass holders will get if they pad Microsoft's cash-flow up front.

These ten cars — the March Forza Motorsport 3 DLC — constitute the first of our two Jalopnik-branded downloadable content packs. You came, you saw, you guessed, and you just might have won. Our exclusive look at the cars below.

On Monday, we took a look at a pretty cool office. On Wednesday, how to make a fake car sound real. Earlier today, a Jalopnik-liveried Shelby. Now, we look at the guts of Forza's digital world. Welcome to the machine.

On Monday, we took you inside Turn 10 Studios, the outfit that created Forza Motorsport and teamed with us on the Forzalopnik download pack. Now it's time for a deeper dive. This is how they make the XBox game loud.

Voting for the Forzalopnik downloadable car pack may be history, but the next phase of the project — making your choices reality — has begun. Welcome to Microsoft's Turn 10 Studios. This is where it all goes down.