It was more than just a cosmetic exercise. It was capable of 1G in the skidpad by use of basic suspension modifications. It had the stock control arms and spindles, but added much stiffer springs, a bigger front sway bar and a smaller rear, 4 wheel disc brakes, 255 50 16 tires on 16x9 in wheels, T-5 manual transmission, and a special 200hp 307 under the hood with experimental swirl port heads and headers on it ( even GM couldn't get much from a 307!). The brake ducts in the body kit were fully functional, and connected to hoses to duct cooler air onto the rotors. The wheel flares were actually necessary to cover the over sized tires. The rear spoiler was also adjustable to optimize the downforce on the rear wheels. It even has a G meter mounted in the dash between the two vents, where a clock would be on the older Cutlass g bodies. The interior was stock except for the G meter, 5 speed and Recaro seats. I have the original Car Craft article on the car from back in the day, and it lists all of the critical specs on it. It is actually the car that inspired my direction with my Cutlass, except that I have updated some of my choices with some new things that are available now.
The one in the bottom picture is not the actual FE3-X, but a tribute car. The original has a cowl hood and flat spoiler, plus an experimental header panel that the bottom lacks. Additionally, the bottom one is an 86, not an 85.