Collection: Engine Upgrades For Subaru Legacy B4 BL
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Torque Solution Turbo Oil Feed Line Kit | Subaru EJ25 w/ Garrett GT Series Turbo (TS-SU-578)
Vendor:Torque SolutionRegular price $106.65 USDRegular priceUnit price / per$133.32 USDSale price $106.65 USDSale -
aFe Sprint Booster V3 Power Converter | Subaru Outback/Legacy XV 19-26 (77-16801)
Vendor:aFeRegular price $314.00 USDRegular priceUnit price / per$314.00 USDSale price $314.00 USD -
COBB FMIC BPV Adapter | Subaru WRX (08-14) / Legacy GT (05-09) (824500)
Vendor:COBBRegular price $80.00 USDRegular priceUnit price / per$80.00 USDSale price $80.00 USD -
Perrin Diverter Valve - Red | 2022+ Subaru WRX / Ascent / Legacy / Outback (PSP-TAC-616RD)
Vendor:Perrin PerformanceRegular price $123.13 USDRegular priceUnit price / per$197.00 USDSale price $123.13 USDSale -

Manley 75mm DE-STROKED Piston Set with Rings | Subaru Impreza/Forester/Legacy/Outback (89-11)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
GFB Mach 2 TMS Recirculating Diverter Valve | Subaru WRX / Legacy / Forester (92+)
Vendor:Go Fast BitsRegular price $198.90 USDRegular priceUnit price / per$221.00 USDSale price $198.90 USDSale -
Manley 32mm Stainless Race Master Valves | Subaru WRX (00-03) / STi (04) (11155-8)
Vendor:Manley PerformanceRegular price $195.18 USDRegular priceUnit price / per$251.36 USDSale price $195.18 USDSale -
Manley 83mm Stroker 100mm +0.5mm Bore 8.5:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (622005C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Manley Performance 75mm DE-STROKED Piston Set | Subaru WRX STi (89-11)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Aeromotive Fuel Rail Kit | Subaru Impreza/WRX (02-14) (14135)
Vendor:AeromotiveRegular price $1,279.28 USDRegular priceUnit price / per$1,449.85 USDSale price $1,279.28 USDSale -
Manley Performance 83mm Stroker 99.75mm +0.25mm Bore Piston Set with Rings | Subaru WRX STi (04+) (622102C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Turbosmart IWG75 Internal Wastegate Actuator | Subaru Impreza WRX/STi (97-21) (TS-0605-1072)
Vendor:TurbosmartRegular price $194.99 USDRegular priceUnit price / per$254.99 USDSale price $194.99 USDSale -

Aeromotive 2002-2014 Subaru WRX / 2007-2014 Subaru STI Fuel Rails | Subaru WRX / STI (02-14) (14134)
Vendor:AeromotiveRegular price $256.01 USDRegular priceUnit price / per$290.15 USDSale price $256.01 USDSale -

Manley 75mm DE-STROKED Piston | Subaru Legacy / Impreza / Forester / Outback / Audi A8 (89-11)
Vendor:Manley PerformanceRegular price $169.89 USDRegular priceUnit price / per$190.01 USDSale price $169.89 USDSale -
Manley 83mm Stroker Piston Set with Rings | Subaru WRX STi (04+) (622100C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Manley 83mm Stroker Piston Set | Subaru WRX STi (04+) (622002C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Manley Extreme Duty Stainless Valves | Subaru WRX (EJ20) / 2004 STi (11139-8)
Vendor:Manley PerformanceRegular price $506.87 USDRegular priceUnit price / per$652.79 USDSale price $506.87 USDSale -
Manley 75mm DE-Stroked Piston Set | Subaru WRX STI (EJ257) (621105C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Manley Performance 75mm DE-STROKED Piston Set | Subaru WRX STi (04+) (SKU: 621100C-4)
Vendor:Manley PerformanceRegular price $679.55 USDRegular priceUnit price / per$760.03 USDSale price $679.55 USDSale -
Manley 36mm Stainless Race Flo Valve | Subaru WRX (00-03) / STI (04) (11138-1)
Vendor:Manley PerformanceRegular price $24.40 USDRegular priceUnit price / per$31.42 USDSale price $24.40 USDSale
Engine Upgrades for Subaru Legacy B4 BL: Boost Power and Reliability
Unlock the full potential of your Subaru Legacy B4 BL with our specialized engine upgrades designed to enhance power, throttle response, and overall engine reliability. Each component in this collection is tailored to fit your model perfectly, ensuring smooth drivability while delivering noticeable performance improvements.
What are the key benefits of upgrading your Subaru Legacy B4 BL engine?
Upgrading your engine components can significantly improve your Legacy’s responsiveness and power delivery. Enhanced intake and exhaust systems increase airflow efficiency, while cooling upgrades help maintain optimal engine temperatures under demanding conditions. These improvements contribute to a more reliable and enjoyable driving experience.
- Improved throttle response and acceleration
- Better thermal management for consistent performance
- Increased engine efficiency and power output
- Enhanced durability with high-quality aftermarket parts
How to choose the right engine upgrades for your Legacy B4 BL?
Selecting the right parts depends on your driving goals and current setup. Intake systems should focus on maximizing airflow without sacrificing drivability, while exhaust upgrades can reduce backpressure for smoother power delivery. Cooling solutions like upgraded radiators or intercoolers are essential if you plan on pushing your engine harder or tuning for more power.
Explore Subaru Legacy B4 BL engine upgrades at WheelFlip
Our collection features a range of performance parts including intake kits, exhaust components, cooling upgrades, and tuning accessories—all chosen for their fitment and reliability on the Legacy B4 BL platform. Shop with confidence at WheelFlip and find the right upgrades to elevate your Subaru’s performance on the street or track.
















