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randy kennedy says: The Y pipe was fitted to my 996TT after exhaust, headers, tune and 16g tubos. The mechanic and I were astounded! It was a tight fit and it gave the tech some headaches but man does it perform. Boo ..
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Jesse Aumiller says: After purchasing this pulley from Vivid Racing the installation had positive effects on the 4-6k rpm range, especially in the first 3 gears. You could definitely feel a bit more power and for the ~ $1 ..
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Paul says: Great product! Really gives the C219 CLS63 a whole new stance and the coils are firm but not brutal. With the dampers set in sport mode there is virtually no bodyroll anymore on the curves. Please ..
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Jack says: I was so happy with the sway bars I decided to take it another step further with the end links. I didn't experience any extra road noise. I now have the ability to fine tune my suspension even more to ..
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justin perron says: I've had the AP valvetronic muffler set up for about 1 month now. some good things: loud-, more power, awesome sound bad things: loud-, remote control device would have been better as a hard wi ..
4 of 5 Stars!


Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 07
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Price: $6,068.00   Sale: $5,673.58
  Model: 20002026
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Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 07

Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm) valve springs with titanium retainers and are ready to install. Perfect for high performance applications. These heads include Cosworth;s S2 version camshafts (KK3920- Japan/European) with the correct cam followers included. This is the perfect head/camshaft combination for serious performance and track day use.

- CNC Ported/Machined finish port
- New Castings
- Hand blended finish work
- Intake 14.63% (average) 22% (max) increased flow
- Exhaust 30.56%(average) 41% (max) increased flow
- 4-angle Inlet Valve job
- 3-angle & radius Exhaust Valve job
- Valves are lapped
- Back-Cut Inlet Valves
- Heads are Ultra Sonic cleaned prior to assembly
- Heads are Serialized and sport a machined Cosworth logo
- +1mm Stainless Steel Intake Valves (1800 degrees max.)
- +1mm Inconel Exhaust Valves (2400 degrees max.)
- Performance Valve Springs
- Titanium Retainers
- Hardened Steel Spring Platforms
- In stock- ready to ship
- Knife edged ports
- Includes S2 Camshafts and cam followers installed
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About Manufacturer: Cosworth
Over the last 50 years Cosworth have developed an in-depth knowledge of engines, electronics and a range of high performance technologies. This has been used to supply some of the most successful motor sport teams and vehicle manufacturers in history.

Our unprecedented success has fueled customer demand globally from diverse market sectors designing and developing technologies and components for aerospace, automotive, defense and sport applications.


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