GrimmSpeed Boost Control Solenoid

2006-2007 Subaru WRX / 2004-2007 STI/ 2004-2008 Forester XT

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  • Optimizes the boost control
  • 3-port design
  • Works with the factory ECU
  • Super durable
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GrimmSpeed Boost Control Solenoid


  • Decreases the spool time
  • The proprietary internal modification design prepares the solenoid for extreme conditions below the vehicle
  • Plug and play operation directly into the factory wiring harness with no modification required
  • Works safely with the factory ECU
  • Provides a quicker, and more precise boost control response
  • Makes tuning more simple and direct for the tuner
  • Includes the 3-port boost control solenoid
  • Includes nickel-plated fittings
  • Includes the plug-and-play connector
  • Includes a laser cut and CNC bent steel bracket that is zinc plated with stainless press-in nuts
  • Includes 1/4" vacuum hose and zip ties
  • Includes all of the rest of the necessary hardware for the installation



The GrimSpeed Electronic Boost Control Solenoid is one of GrimmSpeed's most utilized upgrades due to its durability, simplicity of use, and the performance it delivers. This is a must-have for those of you who are getting your vehicle fine-tuned outside of the capacities of the factory 2-port boost control unit. The 3-port system works by interrupting the boost signal that travels from the turbocharger to the wastegate. The factory system will 'bleed' the signal between the turbocharger and the wastegate which will create a system that reacts slowly, and with less precision. The GrimmSpeed BCS will provide a much tighter boost control and consistency that makes life easier for the tuner as the boost control will be more prompt and precise. 


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