4 Port Boost Control Solenoid

4 Port Electronic Boost Control Solenoid

A genuine MAC Valves 45 series 4-port solenoid for precise, ECU-controlled boost. This 12V valve is a proven, compact option for turbocharged builds that use PWM boost control. 9T Performance Boost Control Solenoids are a great alternative or replacement option for other brand name options on the market.  

BOOST CONTROL SOLENOID DETAILS:

• New and authentic: genuine MAC Valves, Inc. 45 series 4-way valve, not a knock-off
• Works with most PWM-capable ECUs: ECUMaster, Haltech, MaxxECU, Link, MoTec, AEM, Holley, Cobb, Megasquirt and more
• Ready to wire: 18" lead wires included
• Standard 1/8" NPT ports: for common fittings
• Backed by 9T Performance: to help with your Turbo Build or Swap Project

Specifications: 

• Brand / series: MAC Valves, Inc. 45-series
• Type: 4-port / 4-way solenoid valve
• Voltage: 12 VDC
• Power: 5.4 W
• Port size: 1/8" NPT
• Lead wires: 18"
• Condition: New

What's Included

Qty - 1: MAC 45 series solenoid with 18" flying leads.
Looking for everything in one box? - See our 4-Port Boost Control Solenoid Kit.

ECU Compatibility:

This valve works with most aftermarket ECUs that support PWM boost control, including ECUMaster, Holley, Haltech, MaxxECU, Link, MoTec, AEM, Hondata, Grimmspeed, Turbosmart, Autronic, Cobb Tuning, and Megasquirt. Always confirm your ECU's boost control output, recommended PWM frequency and wiring in its manual.

Frequently Asked Questions:

What does a boost control solenoid do?
It lets your ECU regulate the pressure sent to your wastegate actuator, which controls how much boost your turbo makes. The ECU switches the valve on and off rapidly (PWM) to raise or lower boost.

3-port or 4-port kit?
The difference between 3‑port and 4‑port solenoids is how much control authority they give the ECU and how they manipulate pressure on the wastegate’s top and bottom ports. A 4‑port boost solenoid provides a much wider and more aggressive boost control range than a 3‑port, allowing boost levels up to 4–6× the wastegate spring rating, while a 3‑port offers simpler, reliable control suitable for most internal‑gate and many external‑gate setups.

Looking for a simpler option? - See our 3-Port Boost Control Solenoids.

Will it work with my ECU?
If your ECU has a PWM (or low-side switched) output for boost control, most likely yes. Check the ECU manual for wiring and frequency settings, or contact us with your ECU model and we'll help.

Are these genuine MAC valves?
Yes. These are new, authentic MAC Valves, Inc. 35 series valves.

Do I need a tune after installing it?
Yes. Changing boost control hardware changes how your boost behaves. Have your ECU calibrated by a qualified tuner, and double-check your plumbing before driving. Incorrect plumbing can cause overboost and engine damage.

Questions about fitment or plumbing? Email: sales@9tperformance.com.