i share my little 1 cent experience here about Apexi Open Port
about sound yes got but not little BOV sound psssstttt when u rev high and step on cluth to change gear......no such thing but they said for fuel enjection got. i not sure
got air sucking sound when u floor on the gas pedal.
i can hears the air sucking sound quite garang from inside(driving) but from outside i duno loud or not.
about performance......not dare to say very improved but 1 thing for sure is better than ori Proton Black Siput Filter(LMST)
about sound yes got but not little BOV sound psssstttt when u rev high and step on cluth to change gear......no such thing but they said for fuel enjection got. i not sure
got air sucking sound when u floor on the gas pedal.
i can hears the air sucking sound quite garang from inside(driving) but from outside i duno loud or not.
about performance......not dare to say very improved but 1 thing for sure is better than ori Proton Black Siput Filter(LMST)