SpeedFactory Racing 4 Port Boost Control Solenoid Kit Shock Absorbers When fitting a single exit

When fitting a single exit exhaust to your Impreza GRB or GRF

Not all forged H-beam rods are the same

and vibration noises

large tires

strict quality control and rigorous testing

SpeedFactory Racing 4 Port Boost Control Solenoid Kit Shock Absorbers When fitting a single exitThe SpeedFactory Racing 4 Port Boost Control Solenoid Kit allows precise boost control with a PWM (pulse width modulation) signal from a source (Engine Control Module or Electronic Boost Controller). This solenoid can raise the boost level as high as 6 7 times the spring pressure of the wastegate and offers very precise control at very high boost levels. The 4 Port Solenoid also allows you to use much lower wastegate spring pressures for better boost