It's in this Gigantic mod: https://www.beamng.com/resources/wbimp-game-expansion.6880/ --- Post updated ---
I present the Bolide GT-Aero Concept The car has the headlights from the GTT model, a lower and wider rear spoiler, aero-disc front rims, aero wing mirrors and a slightly different front "bumper" with smaller vents (the bottom one is blanked off completely), the fog lights were enlarged and put on the bottom, the blinkers were more sleek but wider to allow a small extra vent below. (This is just a drawing I made, I dont plan on making a mod for it)
This is by far the best option for it. No TRC, ESC, basic radio, 1.6l F4 that has enough punch for it to move and 5 gear that is more than enough.
So, what happens if you take the D15 as Track Version, put a 12V 6BT Cummins in it, take the Wheels from the Bruckell Bastion, slap 305/35R19 Race Tires on it and try to conquer the Nordschleife? Well...you create an absolute Monster. 7:29:263 around the Nordschleife isn't all too shabby (not a very talented Nordschleife driver here). Nearly 2000 Newtonmeters of Torque and 1000 HP do some mind boggling things with a truck.
Profile Comparison of the Remastered Bolide (yellow) and the old version (red), which i like to believe, in universe, is a newer model with a slight redesign