Other than the engine, differences between the two-litre Turbo and the regular 328 were minimal. Accommodating the top-mounted intercooler required a redesigned engine cover, as well as ducting and NACA intakes (positioned just forwards of each rear wheel arch) to feed it with fresh air The rear bumper sported five ventilation holes. A black roof spoiler, optional on the 328, was standard; inside a boost pressure gauge was added to the instrument cluster. The gearlever shows numbers in red instead of white colour.