BRUTAL loud Motorcycle exhaust SOUND #2 (WORLD'S LOUDEST Sound)

The most loudest exhaust sound ever made! brutal loud exhaust Systems in 4 Yamaha motorcycles shooting huge flames and engine revving to the max ... bikers making stupid .. loud 2 step exhaust battle during a stunt show. Also I filmed another crazy exhaust competition of tuned cars here :    • Loudest Exhaust Contest ! Mitsubishi vs BM...