The Sultan RS is a sports car found only in GTA IV, and is based on a highly-modified Lexus IS 200/IS 300, and/or a 2004 Subaru Impreza WRX STI. Others have suggested that it is similar to a Mitsubishi EVO. It is a modified version of the Sultan that also appears in the game.
According to the rocker covers on the engine, it has a 3.5L Twin Turbo powerplant. The car utilizes an AWD drivetrain. It also comes with a carbon fibre hood, roll cage, side exit large-bore exhaust, black race rims, and low-profile tires. Some also have a carbon fibre boot lid, hood scoop, and metallic paint.
The exhaust system is prone to letting unburnt fuel explode in flames from the sidepipes, a trait common to only the most powerful cars in the game. This occurs during throttle liftoff after high revving. The RS is also equipped with a blowoff valve on the turbo which causes a whipping sound when the throttle is released.
This car is extremely quick, and is considered to be one of the best handling and accelerating vehicles in the game. The Sultan RS is clearly a sports car tuned for asphalt racing, and so its hard suspension and low profile tires make it difficult to drive off road.
- Driving the Sultan RS around often results in the rare Sentinel XS STD spawning, especially in Little Italy.
- The Sultan RS has satellite navigation, complete with spoken directions; which is unusual in what seems to be a stripped down, lightweight race car, especially for a high performance turner.
- The Sultan RS is extremely rare, and is not ordinarily found on the street. It is sometimes seen competing in Brucie's races, but stealing one will end the race and count as a loss to the player.
- There is one parked in some bushes behind the "garage", near a run-down mansion in Westdyke, Alderney; the mansion is located at the end of a dirt road.