The Kellison J4 is a real, rare fiberglass-bodied kit car that a handful of fans hope becomes a classic sports pick in GTA 6. Rockstar has not confirmed it, and there is no in-game name for it. Kellison was a small American manufacturer that sold fiberglass sports car bodies for buyers to fit onto their own chassis during the 1950s and 1960s, producing low, light specials built for looks and speed rather than mass-market comfort. It remains an obscure choice next to more famous classics. Its obscurity is exactly what makes it a niche wish-list item rather than a common request. Rockstar has not shown anything like it, and any version that appears would use one of its own fictional makes rather than the real Kellison name.
There is no in-game name or unlock for this, so treat it as a niche fan hope. The interest comes from how rare and distinctive the real kit car is. If something like it appears, expect a light, low-slung sports car with lively handling that depends heavily on whatever engine sits underneath.
| Mod | Slot | Cost | Stat effects | Notes |
|---|---|---|---|---|
| Engine Upgrade | Engine | 12% of base | Acceleration +8 · Speed +5 | — |
| Turbo | Engine | 10% of base | Speed +6 · Acceleration +4 | — |
| Transmission | Engine | 8% of base | Acceleration +5 | — |
| Brakes | Handling | 4% of base | Braking +10 | — |
| Suspension | Handling | 3% of base | Handling +6 | — |
| Sport Wheels | Handling | 5% of base | Handling +2 | — |
| Armor Plating | Protection | 9% of base | Armor +25 · Acceleration -3 | — |
| Bulletproof Tyres | Protection | 2% of base | Durability +15 | — |
| Weapons & Countermeasures | Combat | 15% of base | Firepower +20 | — |
| Respray & Cosmetics | Cosmetic | 3% of base | — | — |
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.
