CP Piston Set 100mm Bore 9.0:1 CR - Subaru EJ25 Turbo Models (inc. 2006-2014 WRX / 2004+ STI)
Manufacturer Part # SC7427
Bundle Savings:MSRP: $806.00
Throw these forged high strength aluminum pistons in and turn up the boost and get more power from your STI! These CP pistons have been put through rigorous testing. In short, they are build to withstand nearly whatever you can throw at em'!
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QUESTIONS & ANSWERS
Q: Forged pistond Anthony 2 years agoAnswer
Hello, I am considering purchasing the 100mm CP forged pistons for my 05 STI. I was just wondering, since the bore on my engine is apx. 99.5mm and I'm purchasing oversized pistons; how do I know what to bore my cylinder walls to in order to compensate for the expansion of forged pistons? Thanks in advance! -Anthony
A: CP piston's to wall clearance is already built into the design. CP's recommended P2W they suggest is .003 on the Subaru engines. You can safely hone the piston bore to 100mm (3.937"). The turn diameter on the piston will be 3.934
Brady R 2 years ago