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BL turbochargers: built by us. Rebuilt by us.
Every Boost Lab turbocharger is assembled by the same technician, to the same standard, every time. BL turbos are built on quality Garrett and MHI-based internals, and the same components we use to build them are the same components we use to rebuild them. The difference is that we know exactly what spec your turbo was built to.
Why your BL turbo comes back to us
A BL turbocharger is not a stock unit. Every one is a modified build assembled in-house with components and specifications that are proprietary to Boost Lab. Sending it anywhere else means sending it somewhere that does not know what is inside it.
We know the spec
Every BL turbo is assembled to a known specification. The compressor wheel trim, turbine wheel design, bearing selection, and balance target are all documented. We rebuild to that exact spec, and the same Garrett and MHI-based internals used to build your turbo originally go back into it on the rebuild.
Same technician standard
Every BL turbocharger is built by the same technician for quality assurance. That same standard applies to every rebuild. Your turbo is not a production line unit and the rebuild does not treat it like one.
Carbon Seal expertise
The BL Carbon Seal turbos use a Garrett-style carbon seal architecture with a Boost Lab proprietary seal plate. The seal plate is a BL-specific component. When a carbon seal unit comes in for rebuild, we restore it to the original BL build spec, the same assembly standard as when it left our shop.
VSR balanced to spec
Every BL turbo leaves the shop VSR balanced. Every rebuild returns VSR balanced to the same target. A turbo rebuilt without VSR is not a turbo rebuilt to BL standard.
- Assembly
- Single-technician build
- Balancing
- VSR balanced every build
- Seal plates
- Proprietary BL components
- Platforms
- Subaru EJ / FA, EVO, Diesel, Universal
- Rebuild trigger
- Condition-based: FOD, engine failure, contamination
Subaru bolt-on turbo upgrades
Boost Lab is regarded as one of the best in the industry for Subaru bolt-on turbocharger upgrades. The BL Subaru lineup covers EJ-engine WRX, STi, and Legacy GT through the current FA24-powered 2022+ WRX. Every unit is a direct bolt-on replacement built to exceed OEM specifications.
The lineup offers two compressor wheel options on most models: billet for maximum strength and aerodynamic efficiency under sustained high-boost operation, and cast for a more accessible price point with the same Boost Lab assembly standard. The HF (High Flow) variants use a higher flowing turbine wheel design that improves exhaust gas evacuation and extends the power band compared to the standard turbine configuration.
Every Subaru BL turbo is a direct bolt-on to the OEM location with no fabrication required. The rebuild process mirrors the original build process: same components, same balance spec, same technician standard.
HF (High Flow) Turbine: The HF variants feature a higher flowing turbine wheel design. This is not a compressor-only change. The turbine wheel specification is different from the standard build and must be accounted for during any rebuild. Sending an HF to a generic shop that does not know the turbine spec risks returning the wrong configuration.
Billet vs Cast: Billet compressor wheels are CNC machined from a single billet blank for tighter tolerances and higher strength at sustained boost. Both variants are VSR balanced at the same specification, but billet wheels require specific balance attention given their different mass distribution compared to cast wheels.
Legacy platform: EJ engine (WRX / STi / Legacy GT / Forester XT)
| Model | Application | Wheel |
|---|---|---|
| BL VF48 | 08-21 Subaru STi | Billet |
| BL VF48 | 08-21 Subaru STi | Cast |
| BL VF48-HF | 08-21 Subaru STi, High Flow | HF Turbine |
| BL VF52 | 08-14 WRX / 05-09 Legacy GT | Billet |
| BL VF52 | 08-14 WRX / 05-09 Legacy GT | Cast |
| BL VF52-HF | 08-14 WRX, 05-09 Legacy GT, High Flow | HF Turbine |
Current platform: FA engine (FA20 / FA24 WRX)
BL54XR 2022+ Subaru WRX (FA24)
The FA platform lineup is expanding. Contact us with your specific FA20 or FA24 application and we will confirm rebuild support. The BL54XR for the 2022+ WRX FA24 is a full Boost Lab modified build and is fully supported for rebuild service.
BL Carbon Seal turbochargers
The BL Carbon Seal turbocharger line uses a Garrett-style carbon seal architecture paired with Boost Lab proprietary seal plates manufactured to our own specifications. Carbon seals offer superior sealing performance compared to standard piston ring seals under high-boost, high-temperature conditions, reducing oil consumption past the seals and improving long-term reliability under sustained performance use.
The seal plate is a BL-specific component. When a Carbon Seal unit comes in for rebuild we assess the seal condition, compressor and turbine wheel condition, and bearing housing. The rebuild restores everything to the original BL build spec with new internals and seal components as required.
Seal Architecture: Garrett-style carbon • Seal Plate: Proprietary BL design • Availability: BL-exclusive component • Balancing: VSR balanced at build • Assembly Standard: Original BL build spec
Other BL platforms
The BL turbocharger lineup extends beyond Subaru. All BL turbos across every platform are built to the same standard and fully supported for rebuild service.
BL TD06SL2R-20G Mitsubishi EVO
Direct bolt-on for Evo 8 and Evo 9. MHI TD06SL2R-based modified build. Full rebuild support.
BL Universal Series universal performance: 34 models
500HP to 1,600HP. Street builds, custom setups, and high-horsepower race applications. Every unit built in-house and VSR balanced. XR series adds dual ball bearing construction. Carbon Seal variants available.
- BL-5757 Entry
- BL-5858 Billet
- BL5757C Carbon Seal, 550HP
- BL5862R Billet 700HP
- BL6062R Billet 750HP
- BL5455X Billet 650HP
- BL5855X Billet 750HP
- BL6262R Billet 780HP
- BL6262RC Billet Carbon Seal, 780HP
- BL54XR Dual BB, 660HP
- BL54XR+ Dual BB, 660HP
- BL7675R Billet 1,250HP
- BL7875R Billet 1,300HP
- BL8088S Billet
- BL8888S Billet
- BL8892S Billet
- BL73XR Dual BB, 1,200HP
- BL79XR Dual BB, 1,450HP
- BL9402R Billet
- BL9802R Billet
- BL8685R Billet 1,600HP
BL Diesel Series diesel / truck
Ford PowerStroke GTP38 OE-replacement and expanding diesel/truck platform coverage. Full rebuild support.
Additional platforms Nissan / BMW / Hyundai / Honda
BL vehicle-specific builds for Nissan, BMW, Hyundai, and Honda. Contact us with your model to confirm rebuild support.
When a BL turbo needs service
A properly installed BL turbocharger running clean oil in a healthy engine does not wear out on a predictable schedule. Rebuild need is condition-based. These are the primary causes we see.
Engine failure contamination
The most common reason a BL turbo comes in for rebuild is an engine event. A spun bearing, ring failure, or head gasket failure sends contaminated oil through the turbo oil supply. The turbo bearings see degraded or contaminated oil and are compromised. Any engine failure on a Subaru should be followed by turbo inspection before returning to service. The turbo bears the consequences of what happens upstream of it.
Foreign object damage (FOD)
Intake-side FOD, debris ingested through the air filter, contacts the compressor wheel at operating speed and causes immediate damage. Turbine-side FOD from broken exhaust components contacts the turbine wheel. Either event typically requires compressor or turbine wheel replacement in addition to a full bearing rebuild. The wheel condition is inspected and documented at teardown before any quote is issued.
Improper installation
A BL turbo installed without priming the oil system, with an obstructed oil feed line, with the oil drain line kinked or running uphill, or with contaminated oil from the first startup will fail faster than one installed correctly. Bearing damage from dry-start or oil starvation at initial startup is not covered under warranty but is fully rebuildable. We document the bearing condition and oil passages to identify installation-related damage.
Extended high-boost operation
BL turbos are built to handle sustained performance use. Under extreme track duty, high-boost tuning above the designed operating range, or extended competition use, bearing wear accumulates faster than street use. High-performance applications running above the designed boost level should be inspected periodically rather than waiting for audible symptoms. Early inspection catches bearing wear before it becomes wheel contact damage.
Send it back to the source
Start a rebuild request and ship your BL turbocharger to us. We will assess, document, and rebuild it to the original BL specification.
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