On the interior the leather trimmed bucket seats had a different stitch pattern, whilst the main instruments were maintained in a hooded nacelle in front of the driver, the clock and oil temperature gauge were moved to a panel at the front of the centre console to make them more easily visible in a separate panel on the lower left edge of the dashboard.
The steering wheel design was also changed to one with satin black spokes, featuring longitudinal slots. As with the preceding model the gear lever in an open gate was mounted in the center console alongside the ashtray, as was the ancillary switchgear and the handbrake.
Under the hood Ferrari placed a transversely mid-mounted aluminum V8 engine with a total capacity of 2926cc, with a bore and stroke of 81mm x 71mm. The engine delivered a claimed 214bhp for European market models, and 205bhp for US market examples, which were fitted with power sapping emission control equipment.
The engine was coupled in unit with the all synchromesh five speed transmission assembly, which was below, and to the rear of the engine’s sump. The gear and final drive ratios were altered to suit the revised characteristics of the fuel injected engine.
Top speed for the 308 GTSi went up to 240 km/h (149 mph).