Manley Performance Platinum Series Piston Set 99.75mm 9.8:1 - Subaru EJ25 Models (inc. 2006-2014 WRX / 2004-2021 STI)
Manley Performance Platinum Series Piston Set 99.75mm 9.8:1 - Subaru EJ25 Models (inc. 2006-2014 WRX / 2004-2021 STI)
Manley Performance
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PRODUCT DETAILS ▾
RallySport Direct proudly carries a great selection of high-performance products to strengthen your engine brought to you by Manley Performance.
These are the Manley Performance Platinum Series Piston Set. These pistons have been machined from lightweight 2618 construction, and they are ideal for those of you looking for a strong piston to sustain a high-horsepower or a high-boost build. These pistons feature an offset wrist pin design that is utilized for quiet start-ups and a perfect ring groove to skirt squareness that is achieved through Manley's "one fixturing" manufacturing method that assures maximum horsepower.
All pistons will come with moly coated skirts, as well as round wire locks, premium chrome moly wrist pins, and premium steel top ring sets, Napier-style second rings and higher tension oil rings from Total Seal.
SPECS:
- Bore: 99.75mm
- Oversize: +.25mm
- Rod length: 5.137"
- Stroke: 79
- Comp distance: 1.209"
- Dome volume (cc): -10
- Cyl head (cc): 51
- Compression ratio: 9.8
- Dish piston type
- Piston weight: 423
- Includes Total Seal piston rings
- Includes wrist pins
- Sold as a complete set of pistons
WHY WE CARRY THIS ▾
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT ▾
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
RallySport Direct proudly carries a great selection of high-performance products to strengthen your engine brought to you by Manley Performance.
These are the Manley Performance Platinum Series Piston Set. These pistons have been machined from lightweight 2618 construction, and they are ideal for those of you looking for a strong piston to sustain a high-horsepower or a high-boost build. These pistons feature an offset wrist pin design that is utilized for quiet start-ups and a perfect ring groove to skirt squareness that is achieved through Manley's "one fixturing" manufacturing method that assures maximum horsepower.
All pistons will come with moly coated skirts, as well as round wire locks, premium chrome moly wrist pins, and premium steel top ring sets, Napier-style second rings and higher tension oil rings from Total Seal.
SPECS:
- Bore: 99.75mm
- Oversize: +.25mm
- Rod length: 5.137"
- Stroke: 79
- Comp distance: 1.209"
- Dome volume (cc): -10
- Cyl head (cc): 51
- Compression ratio: 9.8
- Dish piston type
- Piston weight: 423
- Includes Total Seal piston rings
- Includes wrist pins
- Sold as a complete set of pistons
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