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SKU: 46995-4 | UPC: 807298040882
Manley Sport Compact 99.5mm Bore 1.2mm x 1.2mm x 2.0mm Standard Ring Set for 2004-2011 Subaru Impreza WRX STI
Manley Sport Compact piston ring sets provide exact-fit sealing for Subaru EJ257 2.5L turbo engines in 2004-2011 Impreza WRX STI models. This 99.5mm bore set uses 1.2mm top ring 1.2mm second ring and 2.0mm oil ring for tight combustion seal and reduced oil consumption under boost. Engine builders count on these rings for steady cylinder pressure and lasting strength in high-performance setups.
Key Features
- 99.5mm Bore Sizing: Precision-matched to EJ257 cylinder bores to prevent compression loss and ensure even wear across cylinders.
- 1.2mm x 1.2mm x 2.0mm Thickness: Thin top and second rings cut drag while 2.0mm oil ring handles control for high-RPM turbo operation.
- Hard Chrome Plated Top Ring: Steel base with chrome plating resists scuffing and maintains seal amid high heat and boost.
- Napier Faced Second Ring: Cast iron build supports quick break-in and reliable performance in boosted applications.
- Flex-Vent Oil Control Ring: Three-piece steel setup releases oil vapors to keep combustion chambers clean and power strong.
Product Notes
- Set contains four complete ring packs for one EJ257 engine rebuild.
- Inspect bore finish and piston condition prior to installation for best results.
- Ships in protective 6 x 4 x 1 inch cardboard box weighing 0.65 lbs.
Installation Notes
- Professional installation recommended.
- File-fit rings to specs top gap 0.013-0.016 inch second gap 0.013-0.016 inch oil rails 0.015 inch each expander 0.055-0.065 inch.
- Compatible with stock or aftermarket 99.5mm pistons no additional hardware required.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2011 | Subaru | Impreza | WRX STI |
| 2007 | Subaru | Impreza | WRX STI Limited |
| 2011 | Subaru | Impreza | WRX STI Limited |
| 2010 | Subaru | Impreza | WRX STI Special Edition |
Why Choose Manley?
- Trusted by professional race teams for EJ engine builds worldwide.
- Built with aerospace-grade materials and processes for zero defects.
- Supported by detailed engineering data and real-world dyno testing.
Frequently Asked Questions
-
Q: Will this ring set fit later Subaru STI models?
A: Built for 2004-2011 Impreza WRX STI with 99.5mm EJ257 bores confirm piston bore size for 2012+ models. -
Q: What materials are used in these rings?
A: Top ring chrome-plated steel second napier-faced cast iron oil ring three-piece flex-vent steel for strength and sealing. -
Q: What warranty coverage applies?
A: Manley offers one-year limited warranty against manufacturing defects with certified professional installation.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Protective cardboard box measuring 6 x 4 x 1 inches
- Weight: 0.65 lbs
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