Tohsan said:my car using stock exhaust but the fuel consumption sky rocketed after 2.5 years old,imagine trip from KL to penang both way cost me RM230:angry_smile: ,then when i come back Kl and check,its the stock bullet and the rear box inside empty already. 3 days back went over to Wai heng to change the bullet and black box,not those noisy one,just put back stock size box n bullet, my car fuel consumption go back to normal level already.:regular_smile: