It is doing it at full boost? Or just at light loads and low boost?
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Low boost and revs not a problem.
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Sure you cant adjust it so it vents at full boost? It is adjustable.
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Many many on the US forums have adopted to running no bov on the ct26 and ct20 with no problems reported.
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All report positive boost response.
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I ran no bov for 15k of hard miles on my old car
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(granted not a ct20), at 1.4bar with no negatives, only positives.
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Though it takes a lot to convince people!
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It's on boost surge you want to be worried about, not off boost
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'flutter' which is what you have.
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Whether you choose to get a type s for peace of mind is your choice.
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