Collection: Engine Upgrades For Subaru Legacy B4 BM
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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 -
Eibach HD Adj Endlink | Subaru Forester/Outback/Legacy 11-25 (UEL-10-185HD)
Vendor:EibachRegular price $133.84 USDRegular priceUnit price / per$172.36 USDSale price $133.84 USDSale -
DeatschWerks Set of 4 2400cc Injectors for Subaru WRX 02-14/Legacy GT 07-12/STI 07-15
Vendor:DeatschWerksRegular price $989.00 USDRegular priceUnit price / per$989.00 USDSale price $989.00 USD -
COBB High Flow Fuel Pump | Subaru WRX (08-14) / STI (08-21) / Legacy GT (05-09) (315450)
Vendor:COBBRegular price $190.00 USDRegular priceUnit price / per$190.00 USDSale price $190.00 USD -
COBB One Step Colder Spark Plug Set | Subaru WRX/STI/Legacy GT/Outback XT/Forester XT (D44700)
Vendor:COBBRegular price $65.00 USDRegular priceUnit price / per$65.00 USDSale price $65.00 USD -
COBB Silicone Turbo Inlet V2 Black | Subaru WRX/Legacy GT/Outback XT (08-14/05-09) (724450)
Vendor:COBBRegular price $290.00 USDRegular priceUnit price / per$290.00 USDSale price $290.00 USD -
COBB V3 Air/Oil Separator (AOS) 1L w/ ORB Ports | Subaru WRX/STI/Legacy/Outback/Forester XT (05-21) (822615)
Vendor:COBBRegular price $595.00 USDRegular priceUnit price / per$595.00 USDSale price $595.00 USD -
COBB 4 Bar Map Sensor | Subaru WRX (08-14)/Legacy GT (05-12)/Forester XT (09-13)/Outback XT (05-09) (A22100)
Vendor:COBBRegular price $205.00 USDRegular priceUnit price / per$205.00 USDSale price $205.00 USD -
COBB MAP Sensor Adapter Kit | Subaru WRX (08-14) / Legacy GT (05-09) / Forester XT (09-13) (A22600)
Vendor:COBBRegular price $65.00 USDRegular priceUnit price / per$65.00 USDSale price $65.00 USD -
COBB 4 Bar Map Sensor Kit | Subaru WRX (08-14)/Legacy GT (05-09)/Forester XT (09-13) (A22700)
Vendor:COBBRegular price $235.00 USDRegular priceUnit price / per$235.00 USDSale price $235.00 USD -
COBB AccessPORT V3 ECU Tuner | Subaru WRX/STI (08-14) / Legacy GT (07-12) / Forester XT (07-13) / Outback XT (07-09) (AP3-SUB-003)
Vendor:COBBRegular price $770.00 USDRegular priceUnit price / per$770.00 USDSale price $770.00 USD -
COBB LF Bypass Valve | Subaru WRX (08-14) / Legacy GT / Forester XT / Outback XT (724665)
Vendor:COBBRegular price $405.00 USDRegular priceUnit price / per$405.00 USDSale price $405.00 USD -
COBB 1050x Top Feed Fuel Injectors | Subaru WRX (02-14) / WRX STI (07-21) / Legacy GT / Forester XT (312150)
Vendor:COBBRegular price $625.00 USDRegular priceUnit price / per$625.00 USDSale price $625.00 USD -
ARP Custom Age 625+ Head Stud Kit | Subaru WRX/STi EJ20 & EJ25 (260-4704)
Vendor:ARPRegular price $597.55 USDRegular priceUnit price / per$655.40 USDSale price $597.55 USDSale -
DeatschWerks 255 LPH In-Tank Fuel Pump w/ 10+ Legacy GT/03-08 G35/350Z Set Up Kit
Vendor:DeatschWerksRegular price $92.65 USDRegular priceUnit price / per$109.00 USDSale price $92.65 USDSale -
DeatschWerks 320 LPH In-Tank Fuel Pump w/ 10+ Legacy GT/03-08 G35/350Z Set Up Kit
Vendor:DeatschWerksRegular price $143.65 USDRegular priceUnit price / per$169.00 USDSale price $143.65 USDSale -
Deatschwerks DW420 Series 420lph In-Tank Fuel Pump w/ Install Kit For G35 03-08 350Z 03-08
Vendor:DeatschWerksRegular price $169.15 USDRegular priceUnit price / per$199.00 USDSale price $169.15 USDSale -
Cometic 100mm Bore MLS Headgasket .040" | Subaru 90-01 Impreza/Legacy 2.0/2.5L (H1631SPK040S)
Vendor:Cometic GasketRegular price $47.38 USDRegular priceUnit price / per$57.59 USDSale price $47.38 USDSale -
HKS Fine Tune Upgraded Timing Belt | Subaru WRX/STI/Legacy GT/Forester XT (24999-AF001)
Vendor:HKSRegular price $286.59 USDRegular priceUnit price / per$290.00 USDSale price $286.59 USDSale -
DeatschWerks 05-09 Subaru Legacy GT / 08-14 WRX / 08-21 STI DW430C 430lph Compact Fuel Pump
Vendor:DeatschWerksRegular price $186.15 USDRegular priceUnit price / per$219.00 USDSale price $186.15 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.











