i have the 2016 audi r8 v10 plus from the reward tier 4 and you can also buy it
you can buy the 2015 dodge challenger srt hellcat
you can buy the 2015 ferrari 488 gtb
you can buy the 2016 ford mustang gt350r aka 2016 ford shelby gt350r
you can buy the 2016 jaguar f type project 7
you can buy the 2016 mercedes-benz c 63 s coupe aka 2016 mercedes-amg c63 s coupe
so why pre orders ? is it to get them for free or ?
yes.
so no special livery like motorsport 6 did ?
i think you mixes it with the VIP cars. i can’t remember tier reward cars in FM6 had a special livery?
no im not xD they got a turn 10 livery with them and it is not the turn 10 anniversery pack and im not talking about reward tier cars, i talk about the pre order bonus cars 
ok then i don’t know… you wrote tier reward car in your first sentence and i got locked on to that. lol
i have never got bonus cars for preordering other then what the bundle states from xbox store.
well all the cars i listed is from pre ordering but they are all ingame so i dont know why you get a code if you pre order and yes you got one of the pre order cars as tier reward 4 but when i get my mercedes code for pre ordering i will find out if they have a special horizon 3 livery or if they are just plain, in motorsport 6 i have 3 of 6 pre order cars and all are able to purchase ingame, but the pre order code are the same model just that you can buy the normal one and you can buy the same model just with a livery on it stock so they are the same car just the livery version is called “team forza” like if you got the pre order for the bmw m4 you will have the standar bmw m4 coupe and the team forza m4 coupe
sounds about right 
yeah its allways a ‘‘special’’ livery. i have seen some pre order cars in FM6. like the ford GT nutrigrain edition ore what it was called.
if its like that its a livery.