| The Spec R uses a two solenoid system for better control and stability. It should hold boost more stable than a single solenoid system. The Spec S uses a single solenoid and probably won't be as good as the Spec R in holding boost. From Blitz's site: "Sequential valve control (Spec R only):
Two-solenoid valves operate sequentially depending on the valve-open ratio. Mainly, the first valve will do most of the work at low valve-open ratio and at high valve-open ratio; the second valve will come to play."
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