WRX / STI 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

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

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

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

Cosworth stroker kits the perfect to displacement; torque power to your engine. Each includes select matched components from parts list ensuring reliable performance.
Mitsubishi 4B11 (Evolution X) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft (94mm)
Cosworth Forged Connecting Rods
Cosworth'ston Rings
Mitsubishi 4G63 (Evolution VII-IX) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft
(94mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings
Subaru EJ25 2.6L
Cosworth Forged Pistons (99.5mm)
Cosworth Fully Counterweighted Billet Crankshaft
(81mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings Learn More

JRZ Suspension Engineering offers the best high performance club sport damper available today. Combining the best aspects of our JRZ RS and 2-way racing damper. the JRZ RS Pro gives the owner ultimate suspension tuning ability while maintaining compliance for driving on public roads. A mono tube double adjustable damper with adjustable gas pressure. the JRZ RS Pro offers an increased adjustment range allowing the user to tune the car to their further needs. The JRZ RS Pro is available as a complete kit with springs and mounting hardware. Taking club sport performance to the next level. the RS Pro has a remote canister with a digressive blow off system. Digressive blow off allows for a stiff compression valving while maintaining smooth response. The result is a damper that provides ultra solid platform with smooth bump compliance. JRZ standard 22mm piston rods maximize flow to the blow off valve response to great chassis control without using a high spring rate.

Features
• 22 mm rod strut. 16 mm rod damper
• 12 clicks of compression
• 24 clicks of rebound
• Adjustable gas pressure. mono tube
• Piston designed for high performance
• Large adjustment range
• Fixed hoses for easy mounting. available quick disconnect fittings
• Remote reservoir or piggyback canister 
JRZ RS Pro damper kits are available in piggyback configurations or with remote canisters. The canister can be fixed to the damper for ease of installation. To customize track to track setups and tailor the chassis to the JRZ RS Pro has an extra large adjustment range.
Each adjustment is designed to be an even step giving you predictability when making changes. The design of the JRZ RS Pro takes you to the next level. Stiffer cars with higher levels of power demand the control JRZ can supply. With the control of gas pressure charge as well and compression and rebound adjustments. the JRZ RS Pro will get the most out of your high performance car. The JRZ RS Pro is shipped as a bolt on kit with installation instructions and always comes with our world renowned personal service of JRZ.

Benefits
• Better chassis control for higher rate springs/power/ratio
• Street ride. racing performance
• Easy to change configurations

Recommended applications 
• Highly modified Street/DE
• Experienced club racing
• Entry level professional racing Learn More

For: Subaru WRX Sti YR: 2004-2011 Cyl: 4 App: 2.5L Turbo 6-SHPeed
The FX400 System uses the Power Plus I Pressure Plate with a custom, extremely durable, Sprung Ceramic disc. This is the ultimate extreme duty street and/or road/drag racing system. It is available in a 4,6 or 8 wing (paddle) configuration, with the 4-wing being the more aggressive setup and 8-wing being the less aggressive (please specify which type you prefer). The sprung hub design allows for moderate dampening in high-torque applications, rendering it much more street friendly than solid or rigid designs. This disc is designed for outstanding holding capacity, and rapid heat dissipation. The FX400 ceramic paddle design creates a quick and rapid engagement as well as clutch chatter that may not be ideal for street driven vehicles.  Learn More

For: Subaru WRX Sti YR: 2004-2011 Cyl: 4 App: 2.5L Turbo 6-SHPeed
The FX350 System uses the Power Plus I Pressure Plate with Clutch Masters New Formula Button disc. This clutch is designed for the street enthusiast or weekend racer who plans to abuse their vehicle on an occasional basis and have a spirited driving style. The FX350 clutch system has a higher holding capacity than a segmented Kevlar lining without compromising the street friendly characteristic Clutch Masters is known for. For year’s enthusiast have had to compromise durability for drivability and vise versa, however with Clutch Masters New Formula button we have closed the gap between these two tradeoffs. Learn More

For: Subaru WRX Sti YR: 2004-2011 Cyl: 4 App: 2.5L Turbo 6-SHPeed
The FX250 System uses the Power Plus I Pressure Plate and a hybrid combination of Clutch Masters New Formula Button on one side and a heavy-duty Steel Back Organic friction lining on the other. This clutch is designed for the street enthusiast or weekend racer who plans to abuse their vehicle on an occasional basis and have a spirited driving style. The FX250 clutch system has a higher holding capacity than a traditional full faced Kevlar without compromising the street friendly characteristics Clutch Masters is known for. Learn More