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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: 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

Flat Rate Shipping: $155 - Please select at checkout.
SEIBON Carbon Fiber Front Lips are designed to replace your factory lip (if equipped) or be added to your stock front end for a subtle and stylish look. In addition. many front lips add additional air ducting and down force to the front of your vehicle for added performance.
All SEIBON Carbon Fiber Products are:

Hand Laid
Wet Carbon Fiber
Clear Gel Coated from the Factory
Inspected Before Shipping Carbon Fiber Front Lip
GD Style
Engine :-
Aspiration :- ALL
Vehicle Engine Options :- ALL
Vehicle Interior Options :- ALL Aspiration: ALL
Vehicle Exterior Options :- Fuel: ALL-ALL
Cylinder Type :-
Vehicle Options :-
Carbon Fiber Front Lip
GD Style
Engine :-
Aspiration :- ALL
Vehicle Engine Options :- ALL
Vehicle Interior Options :- ALL Aspiration: ALL
Vehicle Exterior Options :- Fuel: ALL-ALL
Cylinder Type :-
Vehicle Options :- Learn More