Just installed a set of the EVO 1 bar WG actuators, I set them to crack open at 11.5 psi and now hit a solid 1.2 bar with the boost coming on much quicker. I have a 01 TT with a older evo stage 4 (k24) that had the factory actuators, before taking them off I tested them and FYI they started to open at 7.5 psi. It's a really easy install and I would recommend it to all who are thinking of it.
I would also really like to thank Stephan at Imagine auto who went way out of his way to step up and ship me a set overnight UPS at no charge when the 1st set got lost in shipping, it is a real pleasure to deal with shops like that who really take care of their customers....