The Pantera 90 Si would have its styling significantly updated by Marcello Gandini, the man who designed the Miura, Countach, Stratos, and countless others. Only 40 were made.

 90 Si was a significant upgrade over the earlier cars, the 351 cubic inch (5.8 liter) Ford V8 was swapped out for the more advanced 305 bhp 5.0 liter (302 cubic inch) engine with electronic fuel injection, as well as uprated cylinder heads, intake manifolds, camshafts, valves, and pistons.

The suspension was completely revised, the chassis was moderately revised, and a set of four-wheel ventilated and drilled disc brakes were added, with the same Brembo calipers used on the Ferrari F40.

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