the previous exhaust should be a straight flow.. the 5 zigen looks like an S... but the piping diameter looks kinda smallish though... 2.25" - 2.5"...
typically S flow much quieter than straight.. so if the 5 zigen is S... go for it..
i stuck with a Trust straight flow for 2 months... then cant tahan the sound.. put back my good ol Super Drager S flow
typically S flow much quieter than straight.. so if the 5 zigen is S... go for it..
i stuck with a Trust straight flow for 2 months... then cant tahan the sound.. put back my good ol Super Drager S flow