Because I checked the VIN before buying. It's 9FO2W303615 and W stands for turbocharged, according to a VIN checker.What makes you think this model came with a turbo?
The 1979 mustang did come from the factory with a turbo I believe but they have some distinct parts and I doubt someone would remove it.
If you plug in the vin number at foxchassis.com it may tell you if was actually a turbo model.
@FoxChasis may chime in here.
pretty nice mustang regardless