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The HKS unit is good in as far as it is adjustable. (10mm screw on the back with the lock nut)

It cannot leak - by design. The model you have cannot be made to plumb back as can the Super SQV.

Set it loose and I'd have say it's one of the better sounding BOV's. (It sounds the same as the Super SQV)

(That's all personal preference though.)

Idle stability is not affected.

Adjust slightly tighter if engine stalls post quick rev. (Not likely)

Down sides...

It's plastic and quite fragile.

May cause backfires on shift / back off due to non-plumb back. (AFM engine)

For what it's worth a BOV offers no performance gain what so ever.

Fitted by OEM to reduce drive by noise and increase thrust-bearing life in turbochargers.

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