I only made one post about the simbin retro expansion. All the others were free mods. Escort V8's were the favourite.
I am not a big fan of Simbin retro expansion. The Mini is too fast for the BMW and Volvo in the Retro Cool class, and there are only four cars in the Retro Max class (Camaro, Corvette, BMW CSL, and Opel Commodore) and they have no down force and not much mechanical grip for their power. For Commodore I prefer the free Commodore V8 mod. For Corvette and BMW CSL you can have the exact same cars in the GTL_1.3 mod.
Of all the free retro mods I listed the Escort V8's is the only one I raced with racedpartment and everyone loved it.
http://www.nogripracing.com/details.php?filenr=19781
Escort V8's sound fantastic, see my video in this topic.
I love to do setup work and you get two different wets, three different slick compounds, more mechanical grip options than any other mod, and if I remember correctly different rear wings and front splitter.
There are several other free retro mods to choose from but I think the Escort V8 was wanted most. I hope they will not be ruled out of league four.