Collection: Engine Upgrades For Subaru Legacy B4 BM
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HKS SSQV4 Blow Off Valve Kit | Subaru WRX (08-14) / Legacy 2.5 GT (05-06) (71008-AF012)
Vendor:HKSRegular price $408.94 USDRegular priceUnit price / per$434.50 USDSale price $408.94 USDSale -
DeatschWerks 02-12 Subaru WRX / 07-12 Legacy GT/STI 2200cc Injectors (set of 4)
Vendor:DeatschWerksRegular price $859.00 USDRegular priceUnit price / per$859.00 USDSale price $859.00 USD -
DeatschWerks 02-14 Subaru WRX / 07-14 STI/Legacy GT Bosch EV14 1200cc Injectors (Set of 4)
Vendor:DeatschWerksRegular price $569.00 USDRegular priceUnit price / per$569.00 USDSale price $569.00 USD -
Perrin Recirculating Blow Off Valve | 2008-2014 Subaru WRX (PSP-TAC-610)
Vendor:Perrin PerformanceRegular price $236.30 USDRegular priceUnit price / per$278.00 USDSale price $236.30 USDSale -
aFe Pro Guard D2 Oil Filter Set of 4 | Scion FR-S / Subaru BRZ (13-17) (44-LF018-MB)
Vendor:aFeRegular price $54.00 USDRegular priceUnit price / per$54.00 USDSale price $54.00 USD -
aFe Pro GUARD D2 Oil Filter | Scion FR-S / Subaru BRZ 2013 (44-LF018)
Vendor:aFeRegular price $15.61 USDRegular priceUnit price / per$16.00 USDSale price $15.61 USDSale -
aFe Pro GUARD D2 Oil Filter | Nissan Cars (03-13) / Subaru Cars H4 (04-13) (44-LF017)
Vendor:aFeRegular price $15.61 USDRegular priceUnit price / per$16.00 USDSale price $15.61 USDSale -
aFe Pro GUARD D2 Oil Filter | Nissan Trucks (99-14) / Honda Cars (01-14) (44-LF016)
Vendor:aFeRegular price $15.61 USDRegular priceUnit price / per$16.00 USDSale price $15.61 USDSale -

aFe Pro GUARD D2 Oil Filter (4 Pack) | Nissan Cars L4 (02-17) / Subaru Cars H4 (04-17) (44-LF017-MB)
Vendor:aFeRegular price $54.00 USDRegular priceUnit price / per$54.00 USDSale price $54.00 USD -
aFe Pro GUARD D2 Oil Filter (4 Pack) | Nissan Trucks (99-14) / Honda Cars (01-15) (44-LF016-MB)
Vendor:aFeRegular price $54.00 USDRegular priceUnit price / per$54.00 USDSale price $54.00 USD -
ARP Rod Bolt Kits | Multiple Subaru Fitments (260-6301)
Vendor:ARPRegular price $124.34 USDRegular priceUnit price / per$136.37 USDSale price $124.34 USDSale -
ARP Head Stud Kit | 2002-2014 Subaru WRX and 2004-2021 Subaru WRX STI (260-4701)
Vendor:ARPRegular price $276.74 USDRegular priceUnit price / per$303.53 USDSale price $276.74 USDSale -
Brian Crower Spring Retainer Kit | 2002+ Subaru WRX/STi (BC0600)
Vendor:Brian CrowerRegular price From $83.58 USDRegular priceUnit price / per$96.00 USDSale price From $83.58 USDSale -
Brian Crower Single Valve Spring and Steel Retainer Kit | Subaru Multiple Fitments (BC0600S)
Vendor:Brian CrowerRegular price $195.00 USDRegular priceUnit price / per$195.00 USDSale price $195.00 USD -
Brian Crower Dual Spring Titanium Retainer Kit | 2002+ Subaru EJ-Series (BC0610)
Vendor:Brian CrowerRegular price $471.86 USDRegular priceUnit price / per$542.00 USDSale price $471.86 USDSale -
ACT Pilot Bearing | Toyota Tacoma 2002 (PB1004)
Vendor:ACTRegular price $7.00 USDRegular priceUnit price / per$9.00 USDSale price $7.00 USDSale -
K&N Oil Filter | 2015+ Subaru WRX / 2008-2015 Mitsubishi Evo X (HP-1004)
Vendor:K&N EngineeringRegular price $11.82 USDRegular priceUnit price / per$17.99 USDSale price $11.82 USDSale -
Torque Solution Lightweight Crank Pulley | Subaru Impreza WRX/Legacy (02-14) (TS-SU-207A)
Vendor:Torque SolutionRegular price $88.88 USDRegular priceUnit price / per$111.10 USDSale price $88.88 USDSale -
Torque Solution Billet Timing Belt Guide | Subaru WRX (02-14)/STI (04-16) (TS-SU-010)
Vendor:Torque SolutionRegular price $47.99 USDRegular priceUnit price / per$59.99 USDSale price $47.99 USDSale -
Torque Solution -10AN Turbo Oil Return Line Kit | Subaru EJ (TS-SU-486K)
Vendor:Torque SolutionRegular price $115.54 USDRegular priceUnit price / per$144.43 USDSale price $115.54 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.








