Scion FR-S vs Mitsubishi Evolution! X_Project 2.1 GTAIV

Hello everyone! This is my little test sounds from the MW 2012, I do not understand why the Evo is dirty at first, then clean as if nothing had happened? :D Evo - Scion FR-S - _______________________ Music: Organic Audio -- Nurega Illegal Substance -- Microphone Check (SRS OST)