Grimmspeed Overtake BB500 Turbocharger Kit 2002-2007 WRX / 2004-2021 STI

The GrimmSpeed Turbocharger Program was born from a demand for a robust, fast-spooling, high-performance turbo. After more than three years of design, testing, and development, we created OE-location replacement turbos engineered to maximize the potential of your EJ-series engine when paired with GrimmSpeed supporting mods.

The Overtake BB500—features proprietary compressors, turbines, CHRA’s, and wheel designs to optimize airflow and power delivery. Every component was rigorously tested through gas flow analysis, durability trials, and dyno/road testing, setting a new standard for EJ-powered vehicles.

Quick Specs

• Compressor Wheel Size (Inducer/Exducer): 55.1mm / 74.6mm, 54 Trim
• Turbine Wheel Size (Inducer/Exducer): 60mm / 55.1mm, 84 Trim
• Compressor Flow: 55lb-min
• Compressor Inlet Diameter: 2.4"
• Compressor Wheel Type Material/Alloy: Billet 2618
• Compressor Housing Alloy: A356
• Turbine Housing Alloy: D5S
• Bearing Type: Ceramic Ball
  • Ceramic ball bearing design, featuring silver-plated 4340 bearing cages
  • Dual piston rings and advance oil flinger design to combat oil leakage and CHRA pressurization
• Compressor A/R: 0.65
• Turbine A/R: 0.88
• Adjustable Wastegate: Pre-set at 15Psi base pressure

FITMENTS:

• 2004-2021 Subaru STI
• 2002-2007 Subaru WRX [Other modifications required]
• 2004-2008 Subaru Forester XT [Other modifications required]
• *2008-2014 Subaru WRX [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc] 
• *2005-2009 Subaru Legacy GT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]
• *2005-2009 Subaru Outback XT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]