Engines and Components› Pistons and Piston Rings

Wiseco

Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.25mm - Size +.010 - CR 9.5 Piston Set

$863.99

SKU: W00C K666M8525AP

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Wiseco K666M8525AP is a high-performance piston set with an asymmetric skirt design, a bore of 85.25mm, and a 9.5:1 compression ratio. Constructed from 2618 Aerospace alloy, these pistons offer a superior strength-to-weight ratio and are equipped with ArmorGlide® skirt coating for enhanced durability and reduced friction. This set is ideal for enthusiasts looking for robust and reliable pistons for demanding applications, including heavy horsepower builds. Each set includes shelf stock piston kit with manufacturer's standard warranty.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandWiseco
Part NumberW00C K666M8525AP

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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