I'll chime in with the modded GrA motors and add the ones I've been 'working' on lately, the Savanna RX7/Supra A70.
They're... Alright. Need some new data to make them competitive against the Kunos E30 and other Gr.A cars. It's not really my forte so I'll leave that to the experts.
Come to think of it neither is modding cars so if there's anything wrong just improve them - I'm no pro modder, just a guy bored out of his mind.
Liveries inspired by the RX7 254i LM and the Supra A70 JTCC.
https://we.tl/t-Kw66WcG3ET
edit : also been working on a 240 Turbo GrA but seeing that we now have a couple of them now it's pretty much useless ahah.