To install the unit to new vehicle, modification of SQV on the vehicle’s side is required. SQV Unit, O-ring, C-ring, T-fitting φ6×φ4×φ6, T-fitting φ4×φ4×φ4, Air Filter and Tylap.
I bought a genuine SSQV 4 since the knock-off version wasn't venting well at low rpm and light boost, however, the genuine one has the same issue. The spring itself is a little hard and so only opens at idle and wide open throttle. If there was a way to adjust the spring enough to compensate (like the first gen version), it'd be great!
The sound however is awesome!