An updated Islero, dubbed the Islero S or GTS, was released in 1969. The engine in this model was tuned to 350 brake horsepower (257 kW; 350 PS). There were quite a few styling changes, including brightwork blind slots on the front fenders, an enlarged hood scoop (which supplied air to the interior of the car, not the engine), slightly flared fenders, tinted windows, round side-marker lights (instead of teardrops on the original), and a fixed section in the door windows.
Various other changes included larger brake discs, revised rear suspension and revamped dashboard and interior. The top speed of the GTS improved to 161 mph (259 km/h) and acceleration from zero to 60 mph 6.2 seconds. Only 100 examples of the Islero GTS were built, bringing the production total of the Islero nameplate to 225 cars. Ferruccio Lamborghini himself drove an Islero during that era - as did his brother Edmondo. The car is also famous for its appearance in the Roger Moore thriller The Man Who Haunted Himself.
Source: Wikipedia (original)