IIRC You get it from getting all gold in one of the Kart special events.
How come i didn't get one from golding all the karting events?
I got mine from the karting event too. May have to put it on the marketplace if I don't put it on my E-Type. Think it'll look too much like a smoke spitting chrome auto-dildo? lol
Renrag
Special Events
Karting Gran Turismo Easy: Horn
Karting Gran Turismo Intermediate: Paint Color
Karting Gran Turismo Advanced: Paint Color