 
They are working damn good. They are Dual port , a port on each side of the diaphram. They offer a very low base boost seting and they high boost contolled setting. My base is set at 10PSI (driving) and my max that my turbo can ever produce, a tade over 26PSI (driving). Im sure they could hold more boost. From what i read the dual port gives shaper control because of forces acting on both sides of the diapham. And allows Lower low settings and higher max settings. Maybe these are HKS maybe something else, maybe you can tell me. They came with my GMS gt2560r aka gt28r , and had i search Dual port acctuators and could find do name of brand information. Hooks up same as conventional accuator, but the extra port goes to a vacuum source so it can help suck the waste gate door closed.
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