6 Cyl Annihilation Series (abbreviated from 6 Cylinder Annihilation Series) is a bonus series part of Street-Spec Skirmish and is unlocked upon collecting 7 trophies in Street-Spec Skirmish. It can be found in the Amateur category. This series can be completed without File:Icon Gold.png upgrades. There is also a second bonus series that is part of Street-Spec Skirmish, namely Global Production Pursuit, which is unlocked after the player has earned 14 trophies in Street-Spec Skirmish.