The Cobb tuning 3-port boost control solenoid is an excellent upgrade for your Mazdaspeed3, enabling precise boost control in a simple package that is easy to install and tune. The Cobb 3-port boost control solenoid will eliminate boost fluctuations and boost creep that runs rampant in OEM boost control systems, providing stable and repeatable boost control for accurate tuning and consistent performance. With an operating range up to 120psi, The Cobb boost control solenoid is equally capable of providing stable boost control at stock boost levels as well as extremely high boost levels. Featuring 1/8? low-profile corrosion resistant barb fittings, the Cobb boost control solenoid also uses high quality Viton spools and seals to ensure a long life of accurate performance. The Cobb 3-port boost control solenoid mounts in the stock location, uses a OEM harness connector and includes all hardware, brackets and photo instructions for a complete and painless installation.