Revealed in 1986, the GTB Turbo is nothing more than a 328 GTB created specially for the Italian market in order to avoid tax penalties imposed on models with a displacement of more than two-liters. The car remained into production for three years, with 308 unis produced.
The GTB Turbo was, as its name suggests, is a turbocharged variant of the 328 GTB, but fitted with a 2 liter engine. The car was characterized by a softening of the wedge profile with a redesigned nose that had a more rounded profile, that was complimented by similar treatment to the tail valance panel.
The revised nose and tail sections featured body colour bumpers integral with the valance panels, which reflected the work done concurrently on the Mondial 3.2 models, with which they also shared a similar radiator grille and front light assembly layout.
The exhaust air louvers behind the retractable headlight pods disappeared, with an increase in the size of the front lid louver introduced on the "QV" series, and a new style and position of exterior door catch was provided.
The interior trim also had a thorough overhaul, with new designs for the seat panel upholstery and stitching, revised door panels and pulls, together with more modern switchgear, which combined to reflect the external updating details.
The GTB Turbo model had some differences that differentiated it from its normally aspirated cousin, notably a different engine lid louver and raised central panel arrangement, a NACA duct forward of each rear wheel arch, and a row of five slim exhaust air slots in the rear valance panel. It also featured the rear of roof aerofoil, which was optional on the 328 series, as standard equipment.
Under the hood there was a 2,0 liter V8 engine, with a bore and stroke of 66.8mm x 71mm. The engine retained the Bosch K-Jetronic fuel injection system of its predecessor, but was fitted with an IHI turbocharger with a Behr intercooler operating at a boost pressure of 1.05 bar, with a Marelli MED 807 A electronic ignition system, to produce a claimed power output of 254bhp at 6500rpm.
The GTB Turbo could hit a top speed of 157 mph, while the 0 to 60 mph was made in less than six seconds.