CP Pistons
CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.75mm) - Size (0.25mm) - CR (8.2) - SC7422-4
- SKU:
- CPPSC7422-4
- MPN:
- SC7422-4
- Availability:
- Regularly stocked product
Description
Is this a direct fit for my Subaru WRX STi?
CP Pistons Forged Piston Sets for Subaru EJ257 WRX STi require careful confirmation of your specific vehicle's fitment details prior to purchase and installation.
What is the ideal use for these pistons?
Maximize engine output for demanding motorsport applications with these premium performance forged pistons, scoring a perfect 10 for overall engine performance.
CP Pistons Forged Piston Sets for the Subaru EJ257 WRX STi are engineered for peak performance, achieving a potent 8.2 compression ratio for significantly boosted engine output. Featuring a 99.75mm bore and 0.25mm size, these pistons provide a robust foundation for extreme builds. Trust CP Pistons for unparalleled power and reliability in your high-performance engine.
What Owners Say
Owners and enthusiasts consistently praise CP Pistons for their reliability across multiple engine builds, with longtime users reporting zero problems over years of use. The pistons are particularly valued in high-performance Subaru applications, where builders appreciate specific fitment options like stock compression configurations that have delivered over 400hp on pump gas. Users note that proper machining and quality builds are essential for success with any forged piston, and CP is no exception—poor installation or tuning can lead to issues regardless of brand. The consensus remains strongly positive, with CP Pistons earning trust as a dependable choice for serious forced induction builds.
Key Features
- CP Piston & Ring Set for Subaru EJ257 WRX STi
- Bore (99.75mm)
- Size (0.25mm)
- CR (8.2)
- SC7422-4
Why Choose the CPP Piston Sets -4 Cyl
Delivers enhanced engine power and responsiveness for thrilling acceleration.
Achieves optimal combustion efficiency for a more potent and refined engine.
Provides a robust foundation for extreme performance builds and track use.
Transforms your Subaru's engine for superior durability under demanding conditions.
Who Is This For?
Track / Autocross — 9/10
Premium performance forged pistons for competition.
Drag Racing — 9/10
Designed for significantly boosted engine output.
Racing Competition — 9/10
Premium performance forged pistons for competition.
Street Performance — 8/10
Boosted engine output for enhanced street driving.
Engine Performance — 10/10
Achieve significantly boosted engine output.
Frequently Asked Questions
What vehicles are CP Pistons Piston Sets - Forged - 4cyl compatible with?
CP Piston Sets are precisely engineered for specific vehicle applications, with this particular set designed for the Subaru EJ257 WRX STi. Confirm fitment with your specific vehicle before proceeding to ensure optimal integration.
What is the installation difficulty for CP Pistons Piston Sets?
Professional installation is recommended for CP Piston Sets to guarantee correct fitment and optimal performance. A qualified technician can ensure the advanced technical requirements of these forged pistons are met.
What performance outcome can I expect from these CP Piston Sets?
Experience superior engine performance with a 10/10 score for "Engine Performance," delivering significantly boosted engine output. These pistons are built for enthusiasts who demand the highest levels of power for demanding motorsport applications.
Is upgrading to CP Pistons worthwhile for my 4-cylinder engine?
Upgrading to CP Pistons provides a robust foundation for extreme performance builds, offering superior durability under demanding conditions. The 8.2 compression ratio achieves optimal combustion efficiency for a more potent and refined engine compared to stock.
What is the compression ratio of these CP Pistons?
These CP Pistons achieve a potent 8.2 compression ratio, significantly boosting engine output for thrilling acceleration. This advanced compression level is crucial for maximizing performance in track and drag racing scenarios.
Additional Resources
Important Notices
⚠️ CARB Notice: This product is NOT legal for street use in California under CARB (California Air Resources Board) regulations. For off-road or race use only.
Additional Information
CARB: |
This product is not CARB Legal and not for sale in California |
Clearance Item: |
N |
MPN: |
SC7422-4 |
Proposition 65: |
N |
Case Lot Quantity: |
1 |
Category: |
Engine Components>Piston Sets - Forged - 4cyl |
Product Level: |
Premium Performance |
Track / Autocross: |
9/10 |
Drag Racing: |
9/10 |
Racing Competition: |
9/10 |
Street Performance: |
8/10 |
Engine Performance: |
10/10 |
Related Products
Related Products
CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.5mm) - Size (Standard) - CR (8.2) - SC7420-4
CP Pistons
JE Pistons SUB STI EJ257 99.75mm Bore CR 8.5 KIT Set of 4 Pistons - 296348
JE Pistons
Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings - 612002C-4
Manley Performance
Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings - 612102C-4
Manley Performance