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The Cosworth Subaru EJ25 CS600 series is designed extreme track use the demanding performance enthusiast. Each assembly is precision built by of Cosworths skilled craftsmen using finest components from parts catalog to ensure maximum reliable power performance. Starting with a Subaru EJ257 semi closed deck block; we meticulously hone each bore to guarantee perfect piston to cylinder wall clearance. block is then assembled with Forged Pistons; motorsport grade Forged H Beam connecting rods along with high performance and main bearings a STI Forged crankshaft. maximum performance; an optional steel billet crank is available (CS600X). Once cylinder block assembly is completed; we install a pair of CNC machine port-bored Valve Cylinder heads with proven S2 camshafts complete with valve lash to specifications. cylinder heads secured with high performance 11mm steel studs sealed with a Cosworth high performance stopper layer steel head gasket. Finally; we install of blue-printed; high pressure pumps maximum lubrication. This proven engine combination been used by teams to events in both North Americaand Europe.
Key Features
New Subaru EJ25 engine
New Subaru EJ25 Forged Crankshaft
Optional Billet Cosworth Crankshaft (CS600X)
Cosworth Forged H-beam Connecting Rods
Cosworth Forged Pistons rings
Cosworth motorsport Tri-metal bearings
Balanced to within gram
Complete blue-print assembly
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.
Multi angle valve job
CNC Machined port finish
Knife edge port divider
Cosworth S2 High lift camshafts
Valve lash set
Cosworth high pressure pump
Cam covers
Cosworth serial number 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

COMPETITION CLUTCH
Stage 2 - Street Series 2100 Clutch Kit

This assembly provides up to 80% increase in torque capacity and is properly suited for aggressive street use and moderate track use. The Brass Plus material with its alloy backing matched to a performance pressure plate will provide smooth engagement and extended life. 500 mile break-in highly recommended with this set-up. 300 mile break-in REQUIRED with this set-up. (Some kits may not be supplied with all pieces. Please verify with Competition Clutch before ordering).

The 2100 Series kit includes a performance pressure plate; a high torque sprung disc with antiburst steel backed Brass Plus facings; all applicable bearings; and the appropriate alignment tool.

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COMPETITION CLUTCH
Stage 3 - Street/Strip Series 2600 Clutch Kit

This segmented Ceramic material with a performance pressure plate will provide the ultimate in street and strip combinations. This assembly is suited for up to 150% increase in torque capacity. Provides quick but smooth engagement and extended life.

The 2600 Series kit includes a performance pressure plate; a high torque sprung disc with segmented Ceramic facings; all applicable bearings; and the appropriate alignment tool.

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Mishimoto Performance Radiators
Whether you are a daily driver looking for an upgrade to your OEM radiator; or a racer looking for a dependable quality radiator; we have just what you are looking for! Mishimoto Performance Radiators are 100% brazed aluminum; ensuring a lasting lifetime of efficient cooling.
Mishimoto guarantees superior performance and quality with an unmatched lifetime warranty on all parts. Learn More

COMPETITION CLUTCH
Stage 4 Sprung - Strip Series 1620 Clutch Kit

This assembly; available with a double spring; six rivet carriage is good for ease of gear transition with higher horsepower. This disc complimented by a performance pressure plate provides up to 250% increase in torque capacity. 300 mile break-in recommended with this set-up.

The 1620 Series kit includes a performance pressure plate; a six puck high torque sprung disc with Ceramic buttons; all applicable bearings; and the appropriate alignment tool.

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For: Mitsubishi Lancer YR: 2008-2010 Cyl: 4 App: 2.0L Turbo Evo X 5spd
Clutch Masters 725/850 Series: Ultra High Performance Twin Disc Street or Race Systems; 300-600% increase in holding capacity Clutch Masters Twin Disc systems are pure racing technology that also works well in high performance street applications. They are designed to hold tremendous horsepower and torque ratings, while retaining a very smooth operation. By slightly increasing the clamping force of the pressure plate and adding to the square inches of usable disc area, CM Twin Discs significantly increase clamping values with only a 25-50% increase in pedal pressure depending on the application. The cover assembly is machined from billet aluminum with 25% more tensile strength than the competition’s cast unit. The flywheel is machined from billet 6061-T6 aluminum to meet SFI spec 1.2 for competition in NHRA, NDRA, IDRC, IHRA, SCCA and NASA. Each aluminum flywheel includes a replaceable heat shield. Steel flywheels are also available on select applications. *725 SERIES – (7.25” Twin Disc) The 725 series is a smaller diameter assembly, which creates less rotating mass and offering quicker, and smoother shifting with much better throttle response. *850 SERIES – (8.50” Twin Disc) The 850 series is a larger diameter assembly, which is designed for high horsepower applications that require smooth engagement, quiet operation and high clamp load. All systems include: * Cover Assembly with attached Diaphragm * Pressure Plate Ring * Two Discs * One Mid Plate * Billet Aluminum Flywheel* * Release Bearing * Pilot Bearing (when applicable) * Pressure Plate Bolts Learn More

Vehicles that are already equipped with factory turbochargers have engines with large potential for power that cannot be fully obtained by using the original turbocharger(s). Big gains can be found by upgrading the exhaust; intake; blow-off valve and intercooler and adding more fuel and boost; but by also replacing the stock turbocharger with a properly sized GReddy turbo upgrade kit; you can experience new levels of power. Kits are available for most popular Japanese turbo vehicles; and for many; we offer a selection of kits with various sizes of turbos from mild upgrades to full-on race ready kits. Depending on application; kits will either bolt onto factory manifolds with integral wastegates or use hand-made SUS manifolds with external wastegates. Learn More

The Cosworth Subaru EJ25 CS600 series is designed extreme track use the demanding performance enthusiast. Each assembly is precision built by of Cosworths skilled craftsmen using finest components from parts catalog to ensure maximum reliable power performance. Starting with a Subaru EJ257 semi closed deck block; we meticulously hone each bore to guarantee perfect piston to cylinder wall clearance. block is then assembled with Forged Pistons; motorsport grade Forged H Beam connecting rods along with high performance and main bearings a STI Forged crankshaft. maximum performance; an optional steel billet crank is available (CS600X). Once cylinder block assembly is completed; we install a pair of CNC machine port-bored Valve Cylinder heads with proven S2 camshafts complete with valve lash to specifications. cylinder heads secured with high performance 11mm steel studs sealed with a Cosworth high performance stopper layer steel head gasket. Finally; we install of blue-printed; high pressure pumps maximum lubrication. This proven engine combination been used by teams to events in both North Americaand Europe.
Key Features
New Subaru EJ25 engine
New Subaru EJ25 Forged Crankshaft
Optional Billet Cosworth Crankshaft (CS600X)
Cosworth Forged H-beam Connecting Rods
Cosworth Forged Pistons rings
Cosworth motorsport Tri-metal bearings
Balanced to within gram
Complete blue-print assembly
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.
Multi angle valve job
CNC Machined port finish
Knife edge port divider
Cosworth S2 High lift camshafts
Valve lash set
Cosworth high pressure pump
Cam covers
Cosworth serial number Learn More