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MAC 4 Port Boost Control Solenoid Valve M135i LCI (F20 & F21)(S) silicone productsMAC 4 port solenoids are generally used for perfecting boost control on aftermarket external wastegate applications. This superior boost control solenoid only has a 2 wire installation, the port connections are also detailed making overall installation very easy. These are the perfectionist tuners choice when using standard or aftermarket ECU's to control boost on external wastegate set ups etc as they are perfect for achieving higher boost thresholds
