Collection: Engine Upgrades For Subaru Legacy B4 BM
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Torque Solution Steering Rack Brace | 2008-2021 Subaru WRX/STI (TS-SU-388)
Vendor:Torque SolutionRegular price $53.33 USDRegular priceUnit price / per$66.65 USDSale price $53.33 USDSale -
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 -
Torque Solution -10AN Turbo Oil Return Fitting | Subaru EJ (TS-SU-486)
Vendor:Torque SolutionRegular price $48.88 USDRegular priceUnit price / per$61.10 USDSale price $48.88 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 -

GFB Mach 2 TMS Recirculating Diverter Valve - 33mm Inlet/33mm Outlet (suits Mitsubishi EVO I-X)
Vendor:Go Fast BitsRegular price $180.45 USDRegular priceUnit price / per$200.50 USDSale price $180.45 USDSale -
JE Pistons SUB STI EJ257 99.5mm Bore CR 8.5 KIT Set of 4 Pistons
Vendor:JE PistonsRegular price $899.99 USDRegular priceUnit price / per$899.99 USDSale price $899.99 USD -
Manley Subaru EJ20/EJ25 4340 Billet 79mm Stroke Turbo Tuff Series Crankshaft
Vendor:Manley PerformanceRegular price $2,091.05 USDRegular priceUnit price / per$2,201.10 USDSale price $2,091.05 USDSale -

PERRIN 08-14 Subaru WRX / 05-09 LGT & OBXT / 09-13 Forester XT Bypass/Blow Off Valve - Black
Vendor:Perrin PerformanceRegular price $236.30 USDRegular priceUnit price / per$278.00 USDSale price $236.30 USDSale -
JE Pistons SUB STI EJ257 99.75mm Bore CR 8.5 KIT Set of 4 Pistons
Vendor:JE PistonsRegular price $899.99 USDRegular priceUnit price / per$899.99 USDSale price $899.99 USD -
JE Pistons SUB STI EJ257 100mm Bore CR 8.5 KIT Set of 4 Pistons
Vendor:JE PistonsRegular price $899.99 USDRegular priceUnit price / per$899.99 USDSale price $899.99 USD -
GFB HYBRID TMS Dual Port (33mm Inlet/Outlet) Mitsubishi EVO I-X
Vendor:Go Fast BitsRegular price $234.81 USDRegular priceUnit price / per$260.90 USDSale price $234.81 USDSale -
Torque Solution Steering Damper Lockdown | Subaru WRX/Forester/Legacy GT (TS-SU-310)
Vendor:Torque SolutionRegular price $73.77 USDRegular priceUnit price / per$92.21 USDSale price $73.77 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 -
Radium Engineering Top Feed Fuel Rails | Subaru WRX / STI EJ-Series (20-0577-02)
Vendor:Radium EngineeringRegular price $181.14 USDRegular priceUnit price / per$219.95 USDSale price $181.14 USDSale -
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
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.


















