oem consists of midbox only. no bullet.
so if u want to use straight flow with auto tranny, u shud change to new midbox and twister bullet. the measurement i.e. the distance between midbox and nenas, distance between bullet and midbox remain disclose. and what type of midbox also remain disclose. if u dont want to change the mid-section, just use s-flow la.
it is rm450 (muffler tips u can choose what design u want)
but if u insist to use straight flow, take the rm300. muffler tips is rm120 if u want to change.
it is local good quality custom made muffler.