The Grotti Cheetah from base GTA V with all tuning parts included and fully usable, along with a moving steering wheel.
I've included the .max project file for anyone who wants to make their own fully tunable car.

PUT CHEETAH.DAT INTO THE "carmods" FOLDER! (if it doesn't exist, create a folder called "carmods" in your game folder and put the .dat there)
CAR REQUIRES THIS TRAINER 22.01.08.1 AND UP TO WORK PROPERLY https://gtaforums.com/topic/896795-1000-1080-zolika1351s-trainermod-menu-rewritten/

Use https://gtaforums.com/topic/955449-iv-zolikapatch/ to make the steering wheel move

Vehicles.ide:
cheetah, cheetah, car, INFERNUS, INFERNUS, VEH@LOW, NULL, 1, 0, 0.2500, 0.2500, 0, 5, 1.0 ,0, sports+wheelangle:-18.525
txdp
vehshareV, vehshare
cheetah, vehshareV

Carcols.dat:
cheetah, 0,0,63, 0,0,59, 33,33,27 46,46,127, 6,6,8, 49,49,59, 59,59,127, 88,88,124, 62,62,63, 22,22,64,

Tuning part count: 8
Tuning part list:
High Level Spoiler
Carbon Wing
GT Wing
Triple Exit Exhaust
Dual Exit Exhaust
Race Exhaust