GrimmSpeed EJ Subaru BB550+ Turbo Upgrade
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Details
2004-2021 Subaru STi, 2002-2014 WRX, 2005-2009 Legacy GT, Outback XT, GrimmSpeed EJ Subaru BB550+ Turbo Upgrade, GRM.1203.1.0
More horsepower. More top-end performance. No need to tear apart your engine bay. Meet the GrimmSpeed BB550+, engineered to deliver serious power with a true bolt-on design that works with your existing factory-style components.
- Bearing System: Ceramic ball bearing
- Compressor Wheel: Billet 2618 aluminum
- Compressor Wheel Inducer/Exducer: 57.53mm / 71.43mm
- Turbine Wheel: Inconel 713C
- Turbine Wheel Inducer/Exducer: 55mm / 60mm
- Compressor Flow: 73 lbs/min
- Compressor Housing: A356 aluminum
- Compressor Housing A/R: 0.77
- Turbine Housing: HiSiMo
- Turbine Housing Size: 10cm
- Wastegate Actuator Material: 6061 aluminum
- Wastegate Mounting Bracket: Straight, 6-gauge zinc-plated steel
- Boost Control Compatibility: 3-port and 4-port configurations
- Wastegate Base Pressure: 15 PSI (default)
- Adjustable Base Pressure Range: 3–26 PSI with included spring combinations
- Installation: Factory-location bolt-on; no cutting or custom fabrication required
Building on everything we learned from the BB500, we've combined proven engineering with our latest turbocharger technology to develop the BB550+ for next-generation STI performance. Featuring a ceramic ball bearing system, the BB550+ delivers substantially greater horsepower at higher RPM while maintaining strong midrange performance.
At its core is a billet 2618 aluminum compressor wheel and an Inconel 713C turbine wheel, paired with carefully engineered housings designed for durability and high-flow performance. A larger 10cm turbine housing and 0.77 A/R compressor housing support the BB550+'s increased power potential, allowing it to continue building horsepower well into the upper RPM range.
We've also completely redesigned the wastegate actuator, incorporating a billet aluminum body, dual-port design, and heavy-duty steel mounting bracket. Together, these improvements deliver smoother wastegate operation, tighter boost control, and greater flexibility when dialing in your setup.
And like the BB450+, the BB550+ is a true bolt-on turbocharger. It retains the factory mounting location and is designed to work with stock-style connections and existing compatible supporting components. No cutting, custom fabrication, or extensive modifications under the hood required. Just serious power without the complications of a custom turbo installation.
For drivers ready to push their STI further, the BB550+ delivers significantly greater top-end performance while retaining much of the lower-RPM response of its predecessor.
Fitment:
• 04-21 Subaru STI
• 02-07 Subaru WRX [Other modifications required]
• 04-08 Subaru FXT/Baja [Other modifications required]
• 08-14 Subaru WRX/FXT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]
• 05-09 Subaru LGT/OBXT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]
More Information
| Part Number | GRM.1203.1.0 |
|---|---|
| Part Brand | GrimmSpeed |
| Type of Part | Turbo Upgrades |
| Engine Fitment | EJ20, EJ25 |
| Length | 14 |
| Width | 14 |
| Height | 14 |
| Weight | 22.000000 |
Reviews
Fitment
2004-2021 Subaru STi, 2002-2014 WRX, 2005-2009 Legacy GT, Outback XT, GrimmSpeed EJ Subaru BB550+ Turbo Upgrade, GRM.1203.1.0
More horsepower. More top-end performance. No need to tear apart your engine bay. Meet the GrimmSpeed BB550+, engineered to deliver serious power with a true bolt-on design that works with your existing factory-style components.
- Bearing System: Ceramic ball bearing
- Compressor Wheel: Billet 2618 aluminum
- Compressor Wheel Inducer/Exducer: 57.53mm / 71.43mm
- Turbine Wheel: Inconel 713C
- Turbine Wheel Inducer/Exducer: 55mm / 60mm
- Compressor Flow: 73 lbs/min
- Compressor Housing: A356 aluminum
- Compressor Housing A/R: 0.77
- Turbine Housing: HiSiMo
- Turbine Housing Size: 10cm
- Wastegate Actuator Material: 6061 aluminum
- Wastegate Mounting Bracket: Straight, 6-gauge zinc-plated steel
- Boost Control Compatibility: 3-port and 4-port configurations
- Wastegate Base Pressure: 15 PSI (default)
- Adjustable Base Pressure Range: 3–26 PSI with included spring combinations
- Installation: Factory-location bolt-on; no cutting or custom fabrication required
Building on everything we learned from the BB500, we've combined proven engineering with our latest turbocharger technology to develop the BB550+ for next-generation STI performance. Featuring a ceramic ball bearing system, the BB550+ delivers substantially greater horsepower at higher RPM while maintaining strong midrange performance.
At its core is a billet 2618 aluminum compressor wheel and an Inconel 713C turbine wheel, paired with carefully engineered housings designed for durability and high-flow performance. A larger 10cm turbine housing and 0.77 A/R compressor housing support the BB550+'s increased power potential, allowing it to continue building horsepower well into the upper RPM range.
We've also completely redesigned the wastegate actuator, incorporating a billet aluminum body, dual-port design, and heavy-duty steel mounting bracket. Together, these improvements deliver smoother wastegate operation, tighter boost control, and greater flexibility when dialing in your setup.
And like the BB450+, the BB550+ is a true bolt-on turbocharger. It retains the factory mounting location and is designed to work with stock-style connections and existing compatible supporting components. No cutting, custom fabrication, or extensive modifications under the hood required. Just serious power without the complications of a custom turbo installation.
For drivers ready to push their STI further, the BB550+ delivers significantly greater top-end performance while retaining much of the lower-RPM response of its predecessor.
Fitment:
• 04-21 Subaru STI
• 02-07 Subaru WRX [Other modifications required]
• 04-08 Subaru FXT/Baja [Other modifications required]
• 08-14 Subaru WRX/FXT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]
• 05-09 Subaru LGT/OBXT [Equipped with GrimmSpeed Intercooler, STI-Style Conversion Hose, etc]
