The customer could only choose between two paint schemes: silver or red, both paired to the lower half of the body in contrasting metallic gunmetal grey. In the same year, the 2.5-litre Biturbo 2500 or Biturbo E (for Export) was also introduced, and was joined some twelve months later by the Biturbo ES with power outputs , respectively in European- or catalysed US-specification. In 1985, all models received updates and were renamed Biturbo II, Biturbo S II and Biturbo E II. The cylinders were now Nikasil-coated, a more capacious fuel tank was fitted and a Sensitork limited slip differential replaced the earlier Salisbury clutch-type. The second series of the Biturbo was recognizable by its new 6"Jx14" wheels similar in design to the Biturbo S wheels; the S II wheels had fully painted faces, without the silver center.