Since the OP was banned, but I found this question interesting, postin anyhow. There's been quite a bit of development work to prep these cars for off road fun. From the videos below I search for the owner and race team names and you'll eventually find specs from Street to Rallycross to Rally.
[ame="https://www.youtube.com/watch?v=mrou6X0p_Qs"]Will Orders at the 2013 Nameless Rally in the Nameless Performance GT-86. - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=oyjXlt--JhQ"]FR-S Rallycross run 4 - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=5YvuHbf0cIk"]Targa Newfoundland in a Scion FR-S - Living The Dream - YouTube[/ame]
I was pretty quickly able to find a company called Flatout Suspension that has a coilover set @$1800 for this purpose. I'm sure they'd be willing to give you wheel, tire and suspension specs & assistance if you end up going that direction.
https://www.flatoutsuspension.com/pr...ant=3846737796
