Wiseco Piston Set 99.5mm Bore - Subaru EJ25 Turbo Models (inc. 2006-2014 WRX / 2004+ STI)
Manufacturer Part # K598M995AP
Bundle Savings:MSRP: $641.00
RallySport Direct proudly carries essential engine internals brought to you by Wiseco.
On this page, you are looking at the Wiseco High-Performance Forged Piston Set. This is a great option for those of you who are performing an engine rebuild and need a set of pistons that are designed to sustain the perils of high horsepower and high boost.
Here are the details:
- 99.5mm Bore
- 8.9:1 Compression ratio
- Dedicated 2618 alloy forgings
- Includes Nitrided/Napier steel rings
- Includes offset wrist pins
- Skirt coatings
- Complex dish and dome designs
- Special skirt profiles
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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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These are your pistons!
Therallykid07 2 years ago
Blew up my engine and thought don't just fix upgrade bought these put them in my 06 wrxs block after break in been hammering on them since they take way more abuse than factory the piston slap is loud on cold start but they quiet right down after warm up very happy with these pistons I didn't want to install them because they were so pretty new though
Wrxfan1 3 years ago
Installed these with BC connecting rods. they look great (even if you cant see them lol), and work great.
QUESTIONS & ANSWERS
Q: Piston rings Carfreak65 2 months agoAnswer
Are these rings pre filed or do I need to machine them before install??
A: You will need to gap the piston rings prior to installation.
Jared A. 2 months ago
Q: A and B piston sizes Steve 6 months agoAnswer
I'm going to have someone do it for me but I need to ask before any purchasing, do I have to worry about A and B piston sizes or are these pistons just a one size and all I need to do is hone? Ej25.
A: You do not need to worry about A and B piston sizes. These are a 99.5 mm piston and will drop into the EJ25 series motor as long as nothing has been bored out, you are correct in needing to hone.
Tyler G. 6 months ago
Q: Side clearence?? BrycenSpen 2 years agoAnswer
Do these pistons drop right into a 99.5 stock bore or do you have to have your bores machined to the required side clearance?
A: They will drop right into the OEM 99.5mm bore.
Jared A. 2 years ago
Q: piston strength Marseth 2 years agoAnswer
How much hp can these pistons handle? I'm only looking to upgrade my pistons to these without upgrading any other internals
A: There is no official power rating on these pistons. You will achieve more power with proper upgrades to the rest of the internal parts of the motor and tuning.
Brady R 2 years ago