The GTBi’s coachwork remained largely unchanged with respect to the 308 GTB, apart from a few modifications to the interior. The most important changes, however, were made to the engine. In fact, in competition, fuel injection systems had replaced the traditional stacks of carburettors and, as transferring racing experience to production cars has always been part of the Ferrari mission, adopting fuel injection systems was in line with this, helping indirectly to comply with new exhaust emission norms.
With worldwide legislation increasing to reduce exhaust emissions, fuel injection was adopted on the 308 GTB in late 1980, and the model became the 308 GTBi, the “i” suffix in the model designation referring to the fitment of fuel injection. Visually the new model was almost identical to the outgoing one, although the casting pattern of the five spoke alloy wheels changed slightly due to the fitment of Michelin TRX metric size radial tyres. However, the imperial size Michelin XWX tyres on 14” wheels, or Pirelli P7 tyres on 16” wheels were available as an option.