I did it with BMW, now Mercedes:
AMG Vintage Pack $2.99:
-300 SEL 6.8 AMG
-280 E AMG (W123)
-SL73 AMG (R129)
-560 SEC AMG
*Bonus Fully Detailed Interior 190E 2.5 Evolution with the purchase of the full pack.
AMG Pro Pack $2.99:
-G63 AMG
-SL65 Black Series
-A45 AMG
-CLK-GTR V12
And just because:
All Star American Pack $1.99:
-Fully Detailed Interior Chevrolet Corvette Grand Sport C4
-Fully Detailed Interior Chevrolet Corvette ZR-1 C4
-Fully Detailed Interior Chevrolet Camaro SS '02
-Fully Detailed Interior Ford Mustang SVT Cobra R
-Fully Detailed Ford RS200
*Bunus Dodge Viper RT/10 '93 with the purchase of full pack. (New car in the Gran Turismo franchise! Get yours now!)
*DLC Pack cars available to preview in their respective dealerships after v*.** update is installed. Update includes:
-New accurate sound engine.
-Tire and fuel consumption option added to Arcade Mode. (we apologize to our customers. Option was omitted by mistake. We as PD would never downgrade functionality to our game as we strive for being the best virtual experience for car enthusiasts.)
-Opponent selection added in Arcade Mode.
-Tire width selection added to GT Auto.
-Course maker.
-Higher prize give out in GT Mode.
-Adjusted car prizes.
-New Championship, Single and Endurance events added to GT Mode.
-Machine Test added.
-It is possible now to select GT Arena Open (available in Machine Test option).
-Gran Turismo 4-inspired B-Spec mode added.
-Community Features added.
-Engine and Drive Train Swap is now added to tuning options. (Note that engine options are limited within same manufacturer only. Option might not be available with all cars and/or manufacturers).
-Livery Editor is now available through GT Auto.
-Minor bug fixes.
*Please note that our Credit Packs purchasable through the PSN Store are no longer available due to the new in-game credit adjustment. Higher Payouts and lower car prices.
...Yeah right...