Originally posted by razerman
Actually you can create some cars after patch 2.12.
Check my post from the another thread
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I haven't had a chance to check other DLC cars(Those installed from the DLC Icon ingame) as I already have them but I guess they work aswell??
Haven't tested this but I guess it's like this, feel free to correct me if I'm wrong.
I guess that those(aswell as the hybrid) cars exists in your garage as long as you don't enter to that car they do get reseted only if you check them in the garage, atleast other sheets are still unchanged until you enter to them.
JUST BUY THEM!
(You can't buy Stealth and Chromelines because they are not meant for everyone

)
Not that this is directly related to GT500 Stealth and Chrome Line cars, but:
You can 't buy Chevrolet Camaro SS Edge Special, its not available as a DLC that you can get anymore. I don't know if the NAM gamers still have access to this car but I do recall on gtplanet forums it was only released for a short period of time under special circumstances will one be able to acquire the car.
You can't buy Toyota Camry #20 Joey Logano Gamestop Fantasy Nascar, its not available as a DLC. It was only offered to those who pre-ordered GT5 back in 2010 from Gamestop website. Unless if you know of someone who is happy to share you their PSN account with the redeem codes (which I highly doubt if it will ever work).
You can't buy Red Bull X2010 5G, it was probably never available as a DLC. If anything it was only available to Japanese gamers under the condition that they could "borrow" the car to do a special seasonal event.
Last but not least you can't buy any of the GT Academy 2012 cars as they came under a separate disc and/or available through special event restricted to certain countries.
How do you explain all these favouritisms?

There's still plenty of DLC that is not for everyone.
Originally posted by Wakita
if only i got the chance to buy the stealth and chromelines, i would buy them in a hartbeat!
i allready bought all DLC stuff twice now for 2 different accounts.
like you said, nothing will happen to your hybrids after update 2.12 aslong the game don't have to load the car.
i can remenber that 1 car was working without installing DLC, i think it was the BRZ but i'm not sure.
*edit* just created a R8 chromeline and it doesn't work. you can't select the car, not offline or online.
You can probably still buy those cars if you could get your hands on copies of collector's edition of GT5. I do not know if redeeming the codes will give you access to all the GT500 Stealth cars or Chrome Line cars in one hit. I do recall initially they will only give you two or three of each (2-3x GT500 Stealth and 2-3x Chrome Line) depending on where you purchased the collector's edition from. Besides the 6th Chrome Line (Jaguar XJ13 Race Car Chrome Line) was not included in the initial set of Chrome Line cars so I don't know if redeeming codes will also give you acesss to that car.
Japanese gamers got a bit lucky, on their PS Store they can purchase 3 random Chrome Line cars without having to purchase the collector's edition of GT5. You can probably also use that technique as well if you wish to purchase Chrome Line legitimately.
As for the extra purchasing of the exact same DLC items twice or however as many times, you know you could just get the Family Pack which supposedly enables you to use the same PSN (the one with all these DLC items already purchased) to be used on the other accounts. I'm not sure what is the exact limit but I have read that it can be used up to 5 times for a DLC item.