DLC is a very loose term in describing which cars can and/or can't be shared.
Cars that comes in car packs that you see in PS Store cannot be borrowed if someone on your PSN friends list have them on share largely because you don't have the key. The same thing probably also happens with free cars like Scion FR-S, C7 Prototype and/or Camaro Final Prototype.
Cars that comes from promotional stuff like Edge special camaro or Joey Logano's fantasy gamestop nascar probably aren't shareable.
GT500 Stealth and/or Chrome Line cars are largely part of collector's edition of GT5 where they provide a promotional code for you to enter to redeem such cars. They're also not shareable. If you have a Japanese PSN account you can supposedly buy 3 (probably random) Chrome Line cars from PS Store.
Ironically, GT Academy 2012 cars are shareable. I think if you borrow glitched those cars you turn your save from a standard Gran Turismo into academy edition. There's 9 of them in total for 2012 but there are two tradeable GT Academy cars one of which is the 370Z may look identical to the one featured in 2012 gt academy edition. The tell tale sign is the registration plate is different on both. There are rumours around GT Academy Special car not being able to be borrowed, there's only one of them. Last but not least is obviously the DLC N24 GT Academy car which only remains as DLC and without the key you cannot borrow it.
I have yet to see if Red Bull X1 5G can be borrowed or not, they are restricted to only Japanese PSN players (unless you fake your PSN to be Japanese and have participated in that limited time challenge like GT Academy 2012 for instance).
---------- Post added at 04:39 AM ---------- Previous post was at 04:27 AM ----------
Originally posted by pasha19988
Can someone help me its not working on Mac
Sorry but I believe this only runs under a windows environment.
It works under linux, I have it working on mine with wine version: 1.5.24
As for Mac, you have a pretty limited choice, either try getting Codeweaver's wine for Mac (the later the edition generally is the better) and hope it'll work. The only other way is either running windows in virtualised environment via something like VMWare parallels or bootcamp windows. I don't have a Mac myself so I'm just running these off the top of my head.