Originally Posted by O HELLA BMW
hey mike i just got my er cp and hks ssqv4 bov installed but the bov sounds exactly like the stock diverter valves or whatever you call it.
i thought the hks bov made a chirp like whistle sound?
The stock DVs are essentially silent as they vent back into the intake stream, while the BOV vents into the atmosphere. Shoot me an email so we can figure out if there is an issue with your BOV.