"A ghost of an old lady that is said to appear around Mt. Rokko who runs on all fours at blazing speeds. If you look at her back when she passes by you, you can see a piece of paper with the word "Turbo" posted on her. She is not a dangerous ghost but simply one that runs around. Other similar ghosts include the "Dash Hag" of the Shuto Expressway and the "100 km/h Granny" of Hokkaido"
—Soul Hackers Compendium
Persona 2: Eternal Punishment
The rumor to make the 100km/h Hag appear can be obtained from Ixquic. After the rumor is spread she will appear on the third floor of Seedy CD. Once the High Speed Title item is obtained upon her defeat, it can be given to Ixquic for an Incense set.