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Where is your blow off located? The farther away from the compressor the more surge you will generally hear.
Also, the vacuum line should be dedicated (no T's) and it should be very free flowing (those filters sometimes hurt the response)
So before you start shaking your fist at the bypass valve, consider using a dedicated vacuum line, and possibly relocating the bypass closer to the turbocharger.
The HKS bypass is a nice piece if its truly HKS, and not a chinese replica.
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