GrimmSpeed EJ Subaru BB450+ Turbo Upgrade
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Details
2004-2021 Subaru STi, 2002-2014 WRX, 2005-2009 Legacy GT, Outback XT, GrimmSpeed EJ Subaru BB450+ Turbo Upgrade, GRM.1204.1.0
More power shouldn't mean tearing apart your engine bay. Meet the GrimmSpeed BB450+, engineered to deliver substantial horsepower gains 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: 53.4mm / 67.4mm
- Turbine Wheel: Inconel 713C
- Turbine Wheel Inducer/Exducer: 49.1mm / 56mm
- Compressor Flow: 61 lbs/min
- Compressor Housing: A356 aluminum
- Compressor Housing A/R: 0.77
- Turbine Housing: HiSiMo
- Turbine Housing Size: 8cm
- Wastegate Actuator Material: 6061 aluminum
- Wastegate Base Pressure: 15 PSI (default)
- Wastegate Mounting Bracket: Straight, 6-gauge zinc-plated steel
- Adjustable Base Pressure Range: 3–26 PSI with included spring combinations
- Boost Control Compatibility: 3-port and 4-port configurations
- Installation: Factory-location bolt-on; no cutting or custom fabrication required
Taking the place of our JB400, the BB450+ brings a new level of performance to our Subaru turbocharger lineup. At its core is a ceramic ball bearing system, replacing the JB400's traditional journal bearing design for responsive power delivery and strong performance throughout the RPM range.
The BB450+ features a billet 2618 aluminum compressor wheel and an Inconel 713C turbine wheel, paired with carefully engineered housings designed to support airflow, durability, and consistent performance under demanding conditions. An 8cm turbine housing and 0.77 A/R compressor housing help deliver a combination of midrange torque and sustained top-end horsepower.
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 more consistent wastegate operation, tighter boost control, and greater flexibility when dialing in your setup.
And the best part? It's a true bolt-on turbocharger. The BB450+ 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 a straightforward path to considerably more power.
Whether you're replacing your factory turbo or taking the next step beyond the JB400, the BB450+ delivers the performance you're after without the complications of a custom turbo installation.
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.1204.1.0 |
|---|---|
| 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 BB450+ Turbo Upgrade, GRM.1204.1.0
More power shouldn't mean tearing apart your engine bay. Meet the GrimmSpeed BB450+, engineered to deliver substantial horsepower gains 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: 53.4mm / 67.4mm
- Turbine Wheel: Inconel 713C
- Turbine Wheel Inducer/Exducer: 49.1mm / 56mm
- Compressor Flow: 61 lbs/min
- Compressor Housing: A356 aluminum
- Compressor Housing A/R: 0.77
- Turbine Housing: HiSiMo
- Turbine Housing Size: 8cm
- Wastegate Actuator Material: 6061 aluminum
- Wastegate Base Pressure: 15 PSI (default)
- Wastegate Mounting Bracket: Straight, 6-gauge zinc-plated steel
- Adjustable Base Pressure Range: 3–26 PSI with included spring combinations
- Boost Control Compatibility: 3-port and 4-port configurations
- Installation: Factory-location bolt-on; no cutting or custom fabrication required
Taking the place of our JB400, the BB450+ brings a new level of performance to our Subaru turbocharger lineup. At its core is a ceramic ball bearing system, replacing the JB400's traditional journal bearing design for responsive power delivery and strong performance throughout the RPM range.
The BB450+ features a billet 2618 aluminum compressor wheel and an Inconel 713C turbine wheel, paired with carefully engineered housings designed to support airflow, durability, and consistent performance under demanding conditions. An 8cm turbine housing and 0.77 A/R compressor housing help deliver a combination of midrange torque and sustained top-end horsepower.
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 more consistent wastegate operation, tighter boost control, and greater flexibility when dialing in your setup.
And the best part? It's a true bolt-on turbocharger. The BB450+ 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 a straightforward path to considerably more power.
Whether you're replacing your factory turbo or taking the next step beyond the JB400, the BB450+ delivers the performance you're after without the complications of a custom turbo installation.
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]
