TR R180 Billet Rear Differential Cover for Subaru STI 2008–2021 GR/GV and VA (TR-TM2054)
SKU - TR-TM2054
Built for heat and horsepower. The Tomioka Racing R180 billet rear differential cover increases oil capacity and features deep finned cooling for improved heat management. Engineered for hard street use, track days, and endurance sessions.
- +27% oil capacity with a finned exterior for improved heat dissipation
- Hard-anodized 6061-T6 billet aluminum construction for strength and corrosion resistance
- M20 drain & fill ports with magnetic drain & fill plugs included
- Designed for factory Subaru R180 rear differentials on listed STI applications
- Optional OEM Hardware Installation Kit available for customers replacing worn, rusted, damaged, corroded, or missing factory hardware
- Finish: Anodized Gunmetal Blue
Applications (Fitment)
- Subaru Impreza WRX STI 2004–2007 (GDB) — factory R180 rear differential
- Subaru Impreza WRX STI 2008–2014 (GR/GV) — factory R180 rear differential
- Subaru WRX STI 2015–2021 (VA) — factory R180 rear differential
Note: Not compatible with WRX models with R160 rear differentials, BRZ/FR-S/86, or non-R180 applications.
Technical Specifications
| Material | 6061-T6 billet aluminum, CNC-machined |
| Finish | Anodized Gunmetal Blue |
| Capacity Gain | +27% vs. OEM cover |
| Cooling | Machined external fins for increased surface area and heat dissipation |
| Service Ports | M20 drain & fill ports with magnetic plugs included |
| Weight | 4 lb (1.8 kg) |
| Install Time | ~45–60 minutes |
| Hardware | OEM hardware kit sold separately as an optional add-on |
What’s in the Box
- TR R180 CNC Billet Aluminum Rear Differential Cover
- 1 × Magnetic M20×1.5 drain plug
- 1 × Magnetic M20×1.5 fill plug
Optional OEM Hardware Installation Kit
OEM hardware is not included by default. Customers may add the optional OEM Hardware Installation Kit for a more complete installation refresh.
This kit is recommended if your original hardware is worn, rusted, damaged, corroded, or missing.
- 1 × OEM R180 rear differential cover gasket
- 1 × OEM rear differential breather
- 2 × Differential mounting studs & nuts
- 8 × Cover-to-housing mounting bolts
Note: Factory hardware may be reused if it is in good condition. Please inspect all original hardware before installation.
Built for heat and horsepower. The Tomioka Racing R180 billet rear differential cover increases oil capacity and features deep finned cooling for improved heat management. Engineered for hard street use, track days, and endurance sessions.
- +27% oil capacity with a finned exterior for improved heat dissipation
- Hard-anodized 6061-T6 billet aluminum construction for strength and corrosion resistance
- M20 drain & fill ports with magnetic drain & fill plugs included
- Designed for factory Subaru R180 rear differentials on listed STI applications
- Optional OEM Hardware Installation Kit available for customers replacing worn, rusted, damaged, corroded, or missing factory hardware
- Finish: Anodized Gunmetal Blue
Applications (Fitment)
- Subaru Impreza WRX STI 2004–2007 (GDB) — factory R180 rear differential
- Subaru Impreza WRX STI 2008–2014 (GR/GV) — factory R180 rear differential
- Subaru WRX STI 2015–2021 (VA) — factory R180 rear differential
Note: Not compatible with WRX models with R160 rear differentials, BRZ/FR-S/86, or non-R180 applications.
Technical Specifications
| Material | 6061-T6 billet aluminum, CNC-machined |
| Finish | Anodized Gunmetal Blue |
| Capacity Gain | +27% vs. OEM cover |
| Cooling | Machined external fins for increased surface area and heat dissipation |
| Service Ports | M20 drain & fill ports with magnetic plugs included |
| Weight | 4 lb (1.8 kg) |
| Install Time | ~45–60 minutes |
| Hardware | OEM hardware kit sold separately as an optional add-on |
What’s in the Box
- TR R180 CNC Billet Aluminum Rear Differential Cover
- 1 × Magnetic M20×1.5 drain plug
- 1 × Magnetic M20×1.5 fill plug
Optional OEM Hardware Installation Kit
OEM hardware is not included by default. Customers may add the optional OEM Hardware Installation Kit for a more complete installation refresh.
This kit is recommended if your original hardware is worn, rusted, damaged, corroded, or missing.
- 1 × OEM R180 rear differential cover gasket
- 1 × OEM rear differential breather
- 2 × Differential mounting studs & nuts
- 8 × Cover-to-housing mounting bolts
Note: Factory hardware may be reused if it is in good condition. Please inspect all original hardware before installation.