Wiseco Piston Set 100mm Bore - Subaru EJ25 Turbo Models (inc. 2006-2014 WRX / 2004+ STI)
Manufacturer Part # K598M100AP
8.9:1 Compression Ratio
Includes, Wrist Pins, Piston, and rings.
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Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.
RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.
The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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Great parts, great service
NorthernInterceptor 3 years ago
Kudos to the CSR whose name sadly evades me right now... he spent a good chunk of time on the phone with me as we decided which piston offering was correct (ultimately, these ones) for my 2006 LGT. I suffered the dreaded ring land failure due to the original owner not getting the revised stock tune from Subaru. I'm 1100kms in on my break-in with zero issues on these 20-over pistons.My tech was happy that I went with Wisecos as well. Everything went back together perfectly.
jor0768733 4 years ago
Excellent packaging. Quality parts. Nice smooth coating. Perfect for those looking to bored out the cylinder walls to start fresh. I called Weiseco and the remmomended a .003 wall clearance, my builder seemd to have liked that number as well as the pistons and block are made of a different material and the pistons will expand at a different rate. No piston slap at this clearance Very pleased with the product and the service at RSD. Thanks!
QUESTIONS & ANSWERS
Q: Clearance question Chris88 3 years agoAnswer
What would the clearance's be when using these with Darton Iron Dry Sleeves Subaru EJ25 Motors?
A: With the Darton Sleeves out of the box, they will not work with these pistons but the sleeves can be bored out up to 102mm, well encompassing these 100mm bore pistons.
Sterling W. 3 years ago
Q: valves josh_hypermiler37419 5 years agoAnswer
Are these compatible with plus size valves and cams?
A: That is going to heavily depend on your headgasket thickness, AVCS settings, along with rod length. For proper fit that is something you would need to check by claying the motor or having a machine shop check for you due to the millions of variables that play into effect of what other components you are using in your motor.
Kirill C. 5 years ago