Supercharger Boost Control System by SmoothBoost - Factory GM LSA & LS9LSA LS9 Boost Control System SmoothBoost Active Bypass Valve Upgrade your supercharged GM engine with the SmoothBoost Boost Control System, crafted specifically for the factory LSA and LS9 platforms. Replace the stock vacuum bypass with a precision electronic valve for smoother boost control, tighter throttle response, and improved drivabilityideal for aggressive street driving or track use. This boost control system uses a 05 V electronic actuator,
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Supercharger Boost Control System by SmoothBoost - Factory GM LSA & LS9