Collection: Engine Upgrades For Subaru Legacy B4 BL
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Torque Solution Valve Cover Cam Seals | Multiple Fitments (TS-SU-417S)
Vendor:Torque SolutionRegular price $48.88 USDRegular priceUnit price / per$61.10 USDSale price $48.88 USDSale -
Radium Engineering Subaru EJ Top Feed Fuel Rail Conversion Kit
Vendor:Radium EngineeringRegular price $218.45 USDRegular priceUnit price / per$229.95 USDSale price $218.45 USDSale -
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 -
Turbosmart BOV Dual Port Maz/Sub-Blue
Vendor:TurbosmartRegular price $409.49 USDRegular priceUnit price / per$454.99 USDSale price $409.49 USDSale -
Turbosmart BOV Dual Port Maz/Sub-Black
Vendor:TurbosmartRegular price $409.49 USDRegular priceUnit price / per$454.99 USDSale price $409.49 USDSale -
Manley Subaru WRX / STI H Beam Connecting Rod Set | EJ18/20/22/25
Vendor:Manley PerformanceRegular price $554.27 USDRegular priceUnit price / per$615.85 USDSale price $554.27 USDSale -

PERRIN 08-14 Subaru WRX / 05-09 LGT & OBXT / 09-13 Forester XT Bypass/Blow Off Valve - Black
Vendor:Perrin PerformanceRegular price $143.91 USDRegular priceUnit price / per$278.00 USDSale price $143.91 USDSale -
King Engine Bearings Performance Rod Bearing Set | Subaru WRX / STI EJ20/EJ22/EJ25 (+.025) (CR4280XP.026)
Vendor:King Engine BearingsRegular price $43.33 USDRegular priceUnit price / per$73.65 USDSale price $43.33 USDSale -
LIQUI MOLY 1L Synthoil Race Tech GT1 Motor Oil 10W-60 (2068)
Vendor:LIQUI MOLYRegular price $149.94 USDRegular priceUnit price / per$149.94 USDSale price $149.94 USD -
Torque Solution Engine Mounts with Mount Plates | 2006-2015 Subaru WRX/STI (TS-SU-200-PL)
Vendor:Torque SolutionRegular price $311.11 USDRegular priceUnit price / per$388.88 USDSale price $311.11 USDSale -
Manley Subaru WRX / STI H Beam Single Connecting Rod | EJ18/20/22/25 (14024-1)
Vendor:Manley PerformanceRegular price $138.56 USDRegular priceUnit price / per$153.96 USDSale price $138.56 USDSale -
GFB HYBRID TMS Dual Port 03-09 Subaru Legacy GT
Vendor:Go Fast BitsRegular price $234.81 USDRegular priceUnit price / per$260.90 USDSale price $234.81 USDSale -
ARP EJ20/EJ25 Main Bolt Kit | Multiple Subaru Fitments (260-5401)
Vendor:ARPRegular price $463.53 USDRegular priceUnit price / per$508.41 USDSale price $463.53 USDSale -
Torque Solution Turbo Oil Feed Line Kit | Subaru EJ25 w/ Garrett GT Series Turbo (TS-SU-578)
Vendor:Torque SolutionRegular price $106.65 USDRegular priceUnit price / per$133.32 USDSale price $106.65 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 -
Perrin Diverter Valve - Red | 2022+ Subaru WRX / Ascent / Legacy / Outback (PSP-TAC-616RD)
Vendor:Perrin PerformanceRegular price $101.98 USDRegular priceUnit price / per$197.00 USDSale price $101.98 USDSale -

Manley 75mm DE-STROKED Piston Set with Rings | Subaru Impreza/Forester/Legacy/Outback (89-11)
Vendor:Manley PerformanceRegular price $741.18 USDRegular priceUnit price / per$805.63 USDSale price $741.18 USDSale -
GFB Mach 2 TMS Recirculating Diverter Valve | Subaru WRX / Legacy / Forester (92+)
Vendor:Go Fast BitsRegular price $198.90 USDRegular priceUnit price / per$221.00 USDSale price $198.90 USDSale -
Manley 32mm Stainless Race Master Valves | Subaru WRX (00-03) / STi (04) (11155-8)
Vendor:Manley PerformanceRegular price $211.14 USDRegular priceUnit price / per$263.93 USDSale price $211.14 USDSale -
Manley 83mm Stroker 100mm +0.5mm Bore 8.5:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (622005C-4)
Vendor:Manley PerformanceRegular price $741.18 USDRegular priceUnit price / per$805.63 USDSale price $741.18 USDSale
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.













