I know that horizon has a tool for the game but you can’t make wheel tunes or camber tunes with it. Does anyone know of one that does make them.(Please don’t say that you need a J-tag or RGH because I know for a fact that you don’t. It’s the same type of thing as when there was car mods(I.E. Nos and paint) on GTA.) I know that it can be done over USB.) Yes you can transfer a Forza 4 save for things like slight camber, drivetrain swaps, and engine swaps(drivetrain and some engines can’t be swapped in Forza Horizon.) but what I want to do is make wheel tunes. (Wheel tunes are tunes with wheels from other cars. Say you have an Audi and want BMW wheels. It can be done with a save editor and it’s not game breaking. People trade them like base ball cards but it’s a pain to sit in lobby’s and wait for the right tune. The tunes I want to make are rather rare.
Bump to this, I myself am wondering too
I’m (for the 2nd time) in the process of developing a tool that will allow you to mod car setups for Horizon (and Horizon 2) on the 360. Now, if you have Forza Motorsport 4 and Horizon Diamond, we can work together to build the tool in which then you can do all of what you’d like. 
do yku have any other tools ready to download?
hey how can i be able to do that too, i have Diamond and Forza Motorsport 3 but when i go into the garage tab i can tune the cars directly, what can i do ? if horizon wont let me, what other app should i look into. ive been looking for a long while now but all info online about this are heavily outdated…
I sent you a PM about this. This is an old thread that nobody has been actively engaged in for about 4 years.
@ptondo, can you lock this one down? Thanks 