In an effort to improve sales until the 1976 official re-badging, Ferrari sent out factory update #265/1 on July 1, 1975 with technical and cosmetic revisions in many areas. Some of these revisions were implemented piecemeal by dealers. Some made all the revisions while some just made a few. This leaves many 1975 GT4's with a variety of modifications which are hard to document as "correct" to aficionados who may not understand the complicated series of events surrounding this model year. Some of the revisions included adding Prancing Horse badges, repainting in the Boxer two-tone scheme (lower half painted matte black), air conditioning fixes, etc. It also included bumper modification and exhaust changes for North American versions. The Dino 308 GT4 was the only Ferrari legally imported to the US in 1975, and it was also the year Niki Lauda won the Formula One drivers championship and Ferrari won the constructors title.