The Karin Sultan from base GTA V with ALL tuning parts included and fully usable, along with a moving steering wheel and HQ & LQ interior variants.
I've included the .max project file for anyone who wants to make their own fully tunable car.

REQUIRES v65.0 or newer of Zolika1351's Trainer/Mod Menu to work, otherwise the car is completely unusable. v65.1 or newer recommended to avoid instability.
PUT SULTANTUNE.DAT INTO THE "carmods" FOLDER! (if it doesn't exist, create a folder called "carmods" in your game folder and put the .dat there)

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

Vehicles.ide:
sultantune, sultantune, car, SULTAN, SULTAN, VEH@STD, VEH@STD_RI1_LO1, 100, 999, 0.2363, 0.2363, 0, 5, 1.0 ,1, wheelangle:-18.409
txdp
vehshareV, vehshare
sultantune, vehshareV

Carcols.dat (car4):
sultantune, 74,0,83,90, 0,1,1,133, 3,1,1,133, 10,1,1,133 25,1,1,133, 37,1,1,133, 53,6,1,133, 61,1,1,133, 75,1,1,133, 92,1,1,133, 6,0,12,133, 10,0,12,133, 21,0,12,133, 23,0,12,133, 25,0,12,133, 33,0,35,133, 34,0,34,133, 47,0,35,133, 49,0,63,133, 52,0,56,133, 54,0,55,133, 65,0,63,133, 67,0,118,133, 70,0,65,133, 98,0,90,133, 16,0,76,133, 9,0,91,133, 15,0,93,133, 19,0,93,133, 13,0,80,133,

Tuning part count: 26
Tuning part list:
Stock Hood
Double Vented Hood
Carbon Hood
Carbon Vented Hood
Carbon Scooped Hood
Low Level Spoiler
High Level Spoiler
GT Wing
Stock Front Bumper
Custom Front Splitter
Custom Splitter & Intercooler
Stock Rear Bumper
Carbon Rear Diffuser
Stock Exhaust
Titanium Tuner Exhaust
Roll Cage and Chassis Upgrade
Stock Skirts
Custom Skirts
Sunstrip
RS Decal (Trunk)
RS Decal (Body)