After one year of production, only 125 units of the Islero were sold, so Ferruccio Lamborghini took the critics to heart and wanted to improve it, this resulted in the Islero ‘S’-model, also called GTS. The exterior design was only slightly modified, little flares were added to the four wheel arches, a horizontal air exhaust appeared behind each front wheel while the front side windows now showed fixed triangular panes in their front portions.
