Collection: Engine Upgrades For Subaru Legacy B4 BL
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DeatschWerks 02+ Subaru WRX / 07+ STI/LGT Top Feed Fuel Rail Upgrade Kit w/ 1500cc Injectors
Vendor:DeatschWerksRegular price $949.00 USDRegular priceUnit price / per$949.00 USDSale price $949.00 USD -
DeatschWerks 08+ Subaru WRX/STI X2 Series Pump Module -8AN Feed w/ -6AN Return PTFE Plumbing Kit
Vendor:DeatschWerksRegular price $721.65 USDRegular priceUnit price / per$849.00 USDSale price $721.65 USDSale -
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 AccessPORT V3 ECU Tuner | Subaru WRX (06-07) / STI (04-07) / Legacy GT (05-06) / Forester XT (04-06) / Outback XT (05-06) (AP3-SUB-002)
Vendor:COBBRegular price $735.00 USDRegular priceUnit price / per$735.00 USDSale price $735.00 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 -
Torque Solution Urethane Engine Mounts | Subaru WRX STI 04-18 (TS-SU-200-RP-UR)
Vendor:Torque SolutionRegular price $7.99 USDRegular priceUnit price / per$9.99 USDSale price $7.99 USDSale -
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 Head Stud Kits | Multiple Subaru Fitments (260-4702)
Vendor:ARPRegular price $293.27 USDRegular priceUnit price / per$321.67 USDSale price $293.27 USDSale -
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 08-21 Subaru WRX/STI X2 Series Fuel Pump Module w/ Dual DW300 Pumps
Vendor:DeatschWerksRegular price $593.10 USDRegular priceUnit price / per$659.00 USDSale price $593.10 USDSale -

DeatschWerks DW440 440lph Brushless Fuel Pump Single/Dual Controller w/ Install Kit 08-14 Subaru WRX
Vendor:DeatschWerksRegular price $449.65 USDRegular priceUnit price / per$529.00 USDSale price $449.65 USDSale -

DeatschWerks 265 LPH Compact In-Tank Fuel Pump w/ 08-12 WRX/ 08-15 STi / 05-09 LGT Set Up Ki
Vendor:DeatschWerksRegular price $135.15 USDRegular priceUnit price / per$159.00 USDSale price $135.15 USDSale -
DeatschWerks 04-06 STi / 04-06 Legacy GT EJ25 740cc Side Feed Injectors *DOES NOT FIT OTHER YEARS*
Vendor:DeatschWerksRegular price $619.00 USDRegular priceUnit price / per$619.00 USDSale price $619.00 USD
Engine Upgrades for Subaru Legacy B4 BL: Boost Power and Reliability
Unlock the full potential of your Subaru Legacy B4 BL with our specialized engine upgrades designed to enhance power, throttle response, and overall engine reliability. Each component in this collection is tailored to fit your model perfectly, ensuring smooth drivability while delivering noticeable performance improvements.
What are the key benefits of upgrading your Subaru Legacy B4 BL engine?
Upgrading your engine components can significantly improve your Legacy’s responsiveness and power delivery. Enhanced intake and exhaust systems increase airflow efficiency, while cooling upgrades help maintain optimal engine temperatures under demanding conditions. These improvements contribute to a more reliable and enjoyable driving experience.
- Improved throttle response and acceleration
- Better thermal management for consistent performance
- Increased engine efficiency and power output
- Enhanced durability with high-quality aftermarket parts
How to choose the right engine upgrades for your Legacy B4 BL?
Selecting the right parts depends on your driving goals and current setup. Intake systems should focus on maximizing airflow without sacrificing drivability, while exhaust upgrades can reduce backpressure for smoother power delivery. Cooling solutions like upgraded radiators or intercoolers are essential if you plan on pushing your engine harder or tuning for more power.
Explore Subaru Legacy B4 BL engine upgrades at WheelFlip
Our collection features a range of performance parts including intake kits, exhaust components, cooling upgrades, and tuning accessories—all chosen for their fitment and reliability on the Legacy B4 BL platform. Shop with confidence at WheelFlip and find the right upgrades to elevate your Subaru’s performance on the street or track.













