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Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore (Part Number: )
Wiseco Piston Set 99.5mm Bore
Subaru EJ25 Turbo Models (inc. 2006-2014 WRX / 2004+ STI)
Read 4 Reviews | 7 Q&As
Part # K598M995AP
$583.31
msrp: $641.00

Only 2 left!

Features & Product Details

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
  • Specifications

    Brand: Wiseco
    Anti-Friction Coating: Yes
    Bore Size: 99.50mm
    Compression Ratio: 8.9:1
    Head Alteration Required: No
    Machining Required: No
    Material: Forged
    Piston Rings Included: Yes
    QTY: 4
    Wrist Pin Clips: Yes
    Wrist Pins Included: Yes
    Mfgr. Warranty: No Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    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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    REVIEWS & CUSTOMER MEDIA

    4 Reviews
    5 out of 5 Stars
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    No user media. You can upload a photo or video of your install by posting a review.
    These are your pistons! 2 years ago
    Therallykid07
    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
      
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    1 of 1 people found the following review helpful
    amazing product 3 years ago
    Wrxfan1
    Installed these with BC connecting rods. they look great (even if you cant see them lol), and work great.
      
    Was this review helpful?
    2011 STI great pistons 3 years ago
    Quinton Muzyka
    Great fitment packaged with care.
      
    Was this review helpful?
    Very Wise 5 years ago
    SkubyDoo757
    Perfect fitment. Very pleased with well items were packaged.
      
    Was this review helpful?

    QUESTIONS & ANSWERS

    • Q: Piston rings  Carfreak656 months ago

      Are these rings pre filed or do I need to machine them before install??
    • Q: A and B piston sizes  Steve10 months ago

      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.
      • 0 of 0 people found the following answer helpful

        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.
          
        Was this answer helpful?
    • Q: Side clearence??  BrycenSpen2 years ago

      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?
    • Q: piston strength   Marseth3 years ago

      How much hp can these pistons handle? I'm only looking to upgrade my pistons to these without upgrading any other internals
      • 0 of 0 people found the following answer helpful

        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 @ RallySport Direct 3 years ago  
          
        Was this answer helpful?
    • Q: New Shortblock  04sti8084 years ago

      I just ordered an OEM EJ257 shortblock, threw a rod bearing in my last one. Will these pistons drop right into an OEM brand new short block?

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