or use a bren device, tis similar looking to a bleed valve, but has a sprung ball inside, you see the spring at the prefered boost pressure, and it will only open the actuator at that psi, you dont get hardly any spike if atall and it dont leak like a bleed valve.
you can get them for £23 i think from ebay, or apex do them for bout £35 (they are a proper tuning place, prolly better quality.)
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