Collection: Engine Upgrades For Subaru Legacy B4 BM
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Fel-Pro Turbocharger Outlet Gasket | Subaru WRX / Impreza / Legacy / Outback (89-21) (73560)
Vendor:Fel-ProRegular price $11.12 USDRegular priceUnit price / perSale price $11.12 USD -
Fel-Pro Engine Conversion Gasket Set | Subaru WRX / Outback (89-21) (CS26170)
Vendor:Fel-ProRegular price $50.02 USDRegular priceUnit price / perSale price $50.02 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 Turbocharger Inlet Gasket | Subaru WRX (2009-2021) (73561)
Vendor:Fel-ProRegular price $5.29 USDRegular priceUnit price / perSale price $5.29 USD -
Fel-Pro Engine Oil Pan Gasket Set | Subaru WRX (13-14) / WRX STI (13-21) (OS30656C)
Vendor:Fel-ProRegular price $8.00 USDRegular priceUnit price / perSale price $8.00 USD -
Fel-Pro Engine Camshaft Plug Set | Subaru WRX (13-14) / WRX STI (13-20) / Outback (00-12)
Vendor:Fel-ProRegular price $6.04 USDRegular priceUnit price / perSale price $6.04 USD -
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 Water Pump Gasket | Subaru WRX (13-14) / WRX STI (13-21) / Forester (98-13) (35747)
Vendor:Fel-ProRegular price $4.52 USDRegular priceUnit price / perSale price $4.52 USD -
Fel-Pro PermaTorque Engine Cylinder Head Gasket | Subaru WRX (13-18) / Outback (10-12) (${sku})
Vendor:Fel-ProRegular price $46.26 USDRegular priceUnit price / perSale price $46.26 USD -

Fel-Pro Engine Camshaft Seal Kit | Subaru WRX (13-20) / WRX STI (13-21) / Outback (05-09) (TCS46140)
Vendor:Fel-ProRegular price $15.56 USDRegular priceUnit price / perSale price $15.56 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 -
Radium Engineering Top Feed Fuel Rail Upgrade | Subaru WRX/STI (02-14) (20-0567-02)
Vendor:Radium EngineeringRegular price $199.45 USDRegular priceUnit price / per$209.95 USDSale price $199.45 USDSale -
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 -
Fel-Pro Engine Crankshaft Seal Kit | Subaru Impreza / WRX / Outback (89-16) (BS40666)
Vendor:Fel-ProRegular price $12.92 USDRegular priceUnit price / perSale price $12.92 USD -
Fel-Pro Crankshaft Seal | Subaru WRX/Impreza/Legacy/Outback (TCS46009)
Vendor:Fel-ProRegular price $10.04 USDRegular priceUnit price / perSale price $10.04 USD -
Fel-Pro Engine Valve Stem Oil Seal Set | Subaru WRX (13-14) / WRX STI (13-20) / Outback (00-12) (SS72814)
Vendor:Fel-ProRegular price $20.16 USDRegular priceUnit price / perSale price $20.16 USD -
Fel-Pro Turbocharger Mounting Gasket Set | Subaru WRX (13-14) / WRX STI (13-21) / Outback (05-09) (ES72745)
Vendor:Fel-ProRegular price $30.12 USDRegular priceUnit price / perSale price $30.12 USD -
Mishimoto Oil Filler Cap | Subaru Legacy (89-23), Impreza (92-23), Forester (97-23), Outback (93-23), B9 Tribeca (05-15), VW Touareg (02-10), Saab 9-2X (04-06), Tribeca (08-14), Scion FR-S (12-16) (MMOFC-SUB-BK)
Vendor:MishimotoRegular price $50.78 USDRegular priceUnit price / per$59.00 USDSale price $50.78 USDSale -
Mishimoto Oil Filler Cap | Subaru Legacy / Impreza / Forester / Outback / B9 Tribeca / Baja / Touareg / Saab 9-2X / Audi A8 Quattro / Scion FR-S / Subaru BRZ (MMOFC-SUB-HOONRD)
Vendor:MishimotoRegular price $62.07 USDRegular priceUnit price / per$73.00 USDSale price $62.07 USDSale
Engine Upgrades for Subaru Legacy B4 BM: Enhance Power and Reliability
Optimize your Subaru Legacy B4 BM’s performance with our specialized collection of engine upgrades. Designed to fit your vehicle precisely, these parts help you boost power, improve throttle response, and increase engine durability for a more engaging driving experience.
What Are the Key Benefits of Engine Upgrades for the Legacy B4 BM?
Upgrading your engine components can unlock significant improvements in power delivery and overall drivability. From enhanced intake airflow to better exhaust scavenging, these modifications help your Subaru breathe more efficiently and respond faster under load. Additionally, cooling and forced induction upgrades contribute to maintaining optimal engine temperatures and supporting higher performance levels.
- Improved horsepower and torque output
- Sharper throttle response and smoother power curves
- Enhanced engine reliability under demanding conditions
- Refined exhaust sound tailored to your driving style
How to Choose the Right Engine Upgrades for Your Subaru Legacy B4 BM
Selecting the right parts depends on your performance goals and daily driving needs. High-performance intakes and exhaust systems are ideal for increasing airflow and exhaust efficiency, while cooling upgrades help manage heat during spirited driving or track use. Forced induction components like turbochargers or intercoolers can deliver substantial power gains but require supporting modifications and proper tuning to maximize benefits.
Explore Our Curated Engine Upgrade Parts for the Legacy B4 BM
At WheelFlip, we offer a focused selection of engine upgrades tailored for the Subaru Legacy B4 BM. Whether you’re enhancing intake, exhaust, cooling, or forced induction systems, our parts are engineered for perfect fitment and durability. Shop with confidence and unlock your Legacy’s full potential today.



















