Collection: Engine Upgrades For Subaru Legacy B4 BN
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Fel-Pro Engine Conversion Gasket Set | Subaru WRX (15-20) / BRZ (13-20) / Scion FR-S (13-16) / Toyota 86 (17-20) (CS26524)
Vendor:Fel-ProRegular price $52.31 USDRegular priceUnit price / perSale price $52.31 USD -
Fel-Pro Crankshaft Seal Kit | Subaru WRX / BRZ / Scion FR-S / Toyota 86 (07-23)
Vendor:Fel-ProRegular price $55.05 USDRegular priceUnit price / perSale price $55.05 USD -
Fel-Pro Engine Oil Pan Gasket Set | Subaru BRZ / WRX / Toyota 86 (13-20 / 15-21 / 17-20)
Vendor:Fel-ProRegular price $30.28 USDRegular priceUnit price / perSale price $30.28 USD -
COBB 2.5"-2.75" Aluminum Charge Pipe | Subaru WRX/Ascent/Outback XT/Legacy XT (22-25/19-25/20-25) (746110)
Vendor:COBBRegular price $305.00 USDRegular priceUnit price / per$305.00 USDSale price $305.00 USD -
Banks Power Pedal Monster Throttle Sensitivity Booster (Stand-Alone) - Use w/Phone
Vendor:Banks PowerRegular price $295.00 USDRegular priceUnit price / per$327.78 USDSale price $295.00 USDSale -
Banks Power Pedal Fits Monster Stand-Alone Throttle Controller 64325
Vendor:Banks PowerRegular price $295.00 USDRegular priceUnit price / per$327.78 USDSale price $295.00 USDSale -
Cometic MLX Headgasket 95.8mm Bore .032 for Subaru WRX/Ascent/Legacy/Outback (C14180-032)
Vendor:Cometic GasketRegular price $70.06 USDRegular priceUnit price / per$85.13 USDSale price $70.06 USDSale -
Cometic MLX Headgasket 95.8mm Bore .032 for Subaru WRX/Ascent/Legacy/Outback (C14179-032)
Vendor:Cometic GasketRegular price $70.06 USDRegular priceUnit price / per$85.13 USDSale price $70.06 USDSale -
DeatschWerks DW400 Performance Module for 2015-21 WRX - 9-437-7250
Vendor:DeatschWerksRegular price $458.15 USDRegular priceUnit price / per$539.00 USDSale price $458.15 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 -
Fel-Pro 15-21 Subaru WRX / 13-20 BRZ / 13-16 Scion FR-S / 17-20 Toyota 86 Engine Oil Drain Plug Gasket | Universal
Vendor:Fel-ProRegular price $3.51 USDRegular priceUnit price / perSale price $3.51 USD -
Grams Performance 550cc Fuel Injectors | Subaru WRX (02-11) / STI (07+) / Legacy (07-11) (G2-0550-1200)
Vendor:Grams PerformanceRegular price $340.93 USDRegular priceUnit price / per$386.39 USDSale price $340.93 USDSale -
Fel-Pro Engine Coolant Thermostat Housing Gasket | Subaru BRZ (14-23) / Forester (16-23) / Crosstrek (16-23) (36161)
Vendor:Fel-ProRegular price $2.14 USDRegular priceUnit price / perSale price $2.14 USD -
Fel-Pro Engine Water Pump Gasket | Subaru WRX / BRZ / Scion FR-S / Toyota 86 (07-23) (36042)
Vendor:Fel-ProRegular price $5.04 USDRegular priceUnit price / perSale price $5.04 USD -
Fel-Pro Engine Valve Stem Oil Seal Set | Subaru WRX/BRZ/Scion FR-S/86 (SS729331)
Vendor:Fel-ProRegular price $36.66 USDRegular priceUnit price / perSale price $36.66 USD -
Fel-Pro Engine Crankshaft Seal Kit | Subaru WRX (13-20) / BRZ (13-20) / Scion FR-S (13-16) / Toyota 86 (17-20) (BS40748)
Vendor:Fel-ProRegular price $13.66 USDRegular priceUnit price / perSale price $13.66 USD -
Mishimoto Top Mount Intercooler Black 2019-2023 Ascent / 2020-2023 Outback XT / 2020-2023 Legacy XT
Vendor:MishimotoRegular price $699.95 USDRegular priceUnit price / per$770.00 USDSale price $699.95 USDSale -
DeatschWerks 02-14 Subaru WRX / 07-14 Legacy GT / 07-14 STI Bosch EV14 1500cc Injectors (Set of 4)
Vendor:DeatschWerksRegular price $859.00 USDRegular priceUnit price / per$859.00 USDSale price $859.00 USD
Engine Upgrades for Subaru Legacy B4 BN to Maximize Performance
Unlock the full potential of your Subaru Legacy B4 BN with engine upgrades designed specifically for this model. Our selection focuses on enhancing power, throttle response, and engine reliability through quality aftermarket parts engineered for precise fitment and lasting performance.
What Are the Key Engine Upgrades for the Subaru Legacy B4 BN?
Upgrading your Legacy B4 BN’s engine involves several core components that work together to improve performance and drivability. Performance intakes and exhaust systems increase airflow and efficiency, while cooling and forced induction parts help maintain optimal engine temperatures under load. Engine management and tuning accessories allow for precise control over fuel and ignition timing, ensuring your upgrades deliver consistent results.
- High-flow intake systems for improved air delivery
- Performance exhausts that reduce backpressure and enhance sound
- Cooling upgrades such as intercoolers and radiator enhancements
- Engine management tools including ECU tuners and sensors
- Durable engine mounts and drivetrain components for reliability
How to Choose the Right Engine Upgrades for Your Build
Selecting the right parts depends on your performance goals and daily driving needs. If you’re aiming for increased horsepower and throttle response, focus on intake and exhaust upgrades paired with proper tuning. For reliability and sustained performance, prioritize cooling solutions and reinforced drivetrain components. Always consider compatibility and fitment to avoid installation issues and ensure seamless integration with your Legacy’s engine bay.
Why Shop Engine Upgrades for Subaru Legacy B4 BN at WheelFlip?
At WheelFlip, we curate engine upgrades that meet the specific demands of the Subaru Legacy B4 BN platform. Our collection balances performance gains with fitment confidence, helping you build a reliable and powerful setup. Explore our range of intake systems, exhaust upgrades, cooling parts, and tuning accessories to enhance your Legacy’s engine performance with parts you can trust.















