Manley Pistons 99.75mm +.25mm Bore 9.8:1 Dish Extreme Duty Subaru WRX / STI EJ257

Part #: 632302CE-4. Our new Turbo Tuff lineup for EJ25 engines takes aftermarket Subaru pistons to the next level. Inspired by our 'Formula-Won' piston forging, these pistons are built to handle high boost and stress. They run quietly and smoothly, perfect for daily drivers. Made from 2618 alloy, with an offset wrist pin design and skirt coating. Each set comes with a standard 2.500' x .180' wall premium chrome moly wrist pin (P/N 42346), and 9310 alloy .210' wall pin upgrades are available. Order the EXTREME DUTY part number for 9310 pins (P/N 42546). Every set includes premium steel top rings, Napier style second rings, higher tension oil rings for great oil control, and round wire locks. Recommended clearance is .003' for mildly boosted and .0035' for highly boosted engines, measured at specific points from the bottom of the oil ring groove. Manley Subaru EJ257 pistons now feature Napier style second rings and higher tension oil rings (by Total Seal) for better oil control.

Using these Manley pistons in your Subaru WRX or STI EJ257 is straightforward. First, make sure your engine is properly prepped. Check the recommended clearances and adjust as needed before installation. When it comes to daily use, these pistons are designed to run quietly and smoothly, so you don't have to worry about excessive noise or vibrations. For maintenance, keep an eye on the oil level and quality. The high - tension oil rings are great for oil control, but regular oil changes are still crucial. If you plan to upgrade to the 9310 alloy pins, follow the manufacturer's instructions carefully. And always make sure to torque all the components to the specified values during installation to ensure optimal performance and longevity.