The very first 911 turbo (without turbo fender flares), personal car of Louise Piech, sister of Ferry Porsche, is in the basement of the Porsche Museum (minute 3.00 in video)
Porsche Museum Secrets: Part 1 - YouTube
This may be same car mentioned in Michael Cotton’s Porsche 911 Turbo book (highlights that the 930 flares were added as a racing necessity with a sacrifice of aerodynamics).
“One score on which the Turbo could be criticized was its wheel arches, which increased the total overall width of the car by 4.88 in (to 69.9 in) compared with the Carrera 3. They did appear to be unnecessarily wide for the wheel and type equipment supplied (tyres were Pirelli CN36 with 185 section at the front and 215 section at the rear) and indeed they were, but the flares were needed for homologation purposes so that much wider racing wheels could be fitted later on. Spacers were used to bring the wheels out to fill the arches, but Dr. Fuhrmann had the last word by having the Turbo’s engine and running gear fitted into a narrower, standard Carrera bodyshell for his personal use…and this car was a full 10 km/h (6 mph) faster in a straight line!”