The Declasse Sabre Turbo 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. v65.5 recommended to avoid instability and to be able to purchase tuning parts in Pay 'n' Sprays (Vehicle Options - Pay 'n' Spray Mod Garages)
PUT SABRETUNE.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:
sabretune, sabretune, car, SABREGT, SABREGT, VEH@LOW, NULL, 100, 999, 0.2240, 0.2240, 0, 5, 1.0 ,0, wheelangle:-18.7
txdp
vehshareV, vehshare
sabretune, vehshareV

Carcols.dat:
sabretune, 0,0,49, 38,38,85, 0,97,102, 3,0,12, 6,6,4, 11,4,12, 13,13,12, 16,95,90, 24,1,12, 21,21,12, 23,23,2, 31,31,27, 32,113,34, 34,12,34, 49,13,41, 52,0,59, 62,13,69, 76,4,76, 82,85,76, 87,8,76, 89,0,4, 92,95,90, 95,95,2, 106,103,2,

Tuning part count: 28
Stock Hood
Cowl Induction Hood
Ram Air Hood
Triple Intake Bug Catcher
Carbon Hood
Single Intake Bug Catcher
Stock Front Bumper
Painted Front Bumper (new, not in V by default)
Custom Chin Spoiler
Painted & Chin Spoiler
Extended Chin Spoiler
Painted & Large Splitter
Stock Rear Bumper
Painted Rear Bumper
No Roll Cage
Roll Cage and Chassis Upgrade
Stunt Cage
Stock Exhaust
Chrome Tip Exhaust
Big Bore Exhaust
Side Exit Exhaust
Stock Grille
De-Chromed Split Grille
Painted Light Surround
Wheelie Bar
Low Level Spoiler