Subaru Parts

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More

Used to eliminate air pump related valves found on 2006-2008 Subaru Engines. Used high performance applications or adapting later cylinder heads to early engineals the injection ports at cylinder heads. Saves weight; reduces complexity; cleans up engine compartment. Machined from solid aluminum with a Cosworth blue anodized finish. Mounting hardware included. Learn More

For over 40 years; Cosworth's been leader in innovative multi valve cylinder head design both racing high performance production cars. Cosworth Ported Valve Cylinder head range is latest advancement. Modified from OE cylinder head castings; substantial flow improvements upgraded valve train components offer superior performance your high performance engine.
Each original cylinder head design is carefully evaluated tested to establish improvements required to meet target performance level. Hours of testing flow bench validation used to determine best advanced port design yielding maximum usable power response. However; there is more to cylinder head design than just maximum flow. It is critical that port velocits maintained to ensure drivability valve train components matched to guarantee reliable performance. Once of these factors have been tested validated; final port contour is digitized. Using digitized program; we then reshape both intake exhaust ports using axis mill producing an accurate consistent port shape every time. In addition to reshaping enlarging intake exhaust ports; most Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud valves increasing flow performance. After machining; each cylinder head receives a multiangle high performance valve on precision valve seat cutter. Then each cylinder head is ultrasonically; cleaned; serialized then hand assembled with select high performance valve train components; ready to install on your engine.
Key Features
All OE Castings
Enlarged Intake Exhaust ports
Large diameter stainless steel intake valves
Large diameter Inconel exhaust valves
Hi Rev; Dual valve springs
Titanium Retainers
Hardened Steel spring platforms
Reshaped combustion chamber on most applications
Flow bench proven design
Dyno tested
Machined Cosworth Logo
Precision Multi angle valve job
Pre-assembled; ready to install
Machined port bore finish
Knife edge port divider Learn More

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More

Front mounted intercoolers offer improved performance potential Subaru applications. Cosworth front mounted intercooler system the replaces restrictive; heat-soak prone original core. engineered system features an efficient large aluminum core with mandrel bent aluminum tubing maximum performance up to exceeding 600hp.The intercooler core is rubber mounted on a secure bracket system to help eliminate cracking breakage. Installation is simplified as no cutting of vehicle is required. />Features
Large efficient core in anodized black finish subtle appearance.
Large diameter mandrel bent aluminum tubing with fine texture gray powder coated finish.
4-ply heavy duty silicone coupling hoses.
Isolated mounting system.
Liner hose clamps.
No cutting or trimming of vehicle body required.
Comprehensive instruction manual.
Robust intercooler core mounting system Learn More

The Cosworth Subaru High Volume Inlet Manifold is cast from aluminum featuring large tapered runners with radiused inlets improved flow. Plenum volume been substantially increased tuned power. Engineered easy installation is key to making power. Cosworth EJ257 plenum is designed use with 2004-2009 engines equipped with electronic throttle control. plenum is designed use with cable-actuated throttle body EJ20/25 applications. This plenum is designed to replace factory Subaru plenum in vehicles equipped with an aftermarket front-mounted intercooler (FMIC) kit. Throttle body position remains stock; ensuring fitment with brand FMIC kitsigned the stock throttle body intake manifold. 2008-2009 Subaru STIs Cosworth FMIC (p/n 20005378) is highly recommended.
Features
Substantially increased plenum volume
Large; tapered runners with radius inlets
Tuned plenum volume runner length/taper
Over increase in flow
Integral vacuum manifold connection of brake booster; boost gauge; sensor; boost controller; etc.
Will work with standard or forward mount electronic throttle body configurations
Stock throttle body location compatibility with most aftermarket FMIC kits Learn More

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More