The Audi 80 (B3) obtained a major facelift in the autumn of 1991, although the UK launch was not until early 1992. It was from then on known internally as the B4 (or "Typ" 8C). Changes from the B3 included a longer wheelbase, a fully redesigned fuel tank and rear axle to enable the use of folding seats, 15" wheels with more prominent wheel arches, redesigned and painted rear and front bumpers, as well as higher-quality materials for the interior, and a larger boot. The front grille was merged with the bonnet and given a bolder look. This design had been previewed on the 1990 Audi Coupé S2 and was applied to the full lineup of the B3-based Coupés as well in July 1991. The Cabriolet ("Typ" 8G) had been introduced in May 1991 and continued to be built long after the B4 had been replaced, receiving similar updates to the Audi 80 B4 and succeeding Audi A4.