to be honest i really haven't check and whats worse i really dont know, i have a 1987 rocky 2.8 non turbo and besides a manifold it needs ( i think because is noisy ) a new silencer, so my question is: Can it be any silencer that will fit the size of the pipe or does it have to be daihatsu rocky 1987 2.8 non turbo. please i would like to know. thanks