The 1989 Audi 90 IMSA GTO is one of the most legendary Audi race cars
and the sound made by its five cylinder turbo charged engine is just as legendary.
The video bellow shows very rare testing footage of this race car. The Italian
race circuit Vallelunga is a very popular testing circuit used by Audi Sport
during its race car development history. This footage is from 1988 as they were
preparing the new Audi 90 IMSA GTO cars for the 1989 American IMSA GTO series.
The video has some great footage with the awesome sounds from the GTO, enjoy:
