JE Pistons and Rings 100 Bore 79mm Stroke 8.8:1 Comp Subaru WRX / STI EJ257 Billet FSR 2004-2021

Part #: 286463. JE Pistons and rings are top - notch billet racing pistons crafted for Subaru WRX and STI models. Initially developed for the Crawford Performance Unlimited AWD Time Attack Subaru and Ken Block's Gymkhana racecar, these amazing pistons are now accessible to the public. These pistons are 100% CNC machined from high - quality 2618 - T6 wrought aluminum bar stock. They're specifically engineered for high - horsepower road and drag race engines. The pistons have internal and external bracing, which significantly boosts durability and strength. A special 'donut dish' crown and an application - specific under - crown profile effectively redistribute heat and minimize stress in high - horsepower Subaru engines. Unlike forged pistons, billet pistons are machined on every surface, removing all unnecessary weight during manufacturing. This process results in a weight reduction of up to 32 grams compared to other piston designs. High - quality 9310 steel wrist pins and JE Pro Seal Rings are included. For extreme racing, you can upgrade to Diamond Like Carbon (DLC) coated wrist pins. Fitment: JE Piston and Rings SUBARU EJ257 Billet FSR. Features: 100% CNC machined billet piston. Designed for high - horsepower Subaru racing engines up to 1200hp. Only 392 grams, up to 32 grams lighter than other aftermarket pistons. Made from high - quality, certified 2618 - T6 aluminum alloy. Has internal and external strut braces. Comes with premium 9310 steel wrist pins (.905 x 2.250'), DLC upgrade available. JE Pro Seal Piston Rings (1.2, 1.2, 2.5mm) are included. Tru Arc locks for easy installation. Includes 4 pistons and 4 rings.

Using these JE pistons and rings is straightforward. First, make sure your engine is properly prepared and cleaned before installation. The Tru Arc locks make the installation process a breeze. Just follow the standard piston and ring installation procedures for your Subaru WRX or STI EJ257. When it comes to maintenance, regularly check the pistons and rings for wear and tear. If you notice any signs of damage, such as scoring or excessive wear, it's time to replace them. For extreme racing applications, consider upgrading to the DLC - coated wrist pins for better performance. Also, keep in mind that these pistons are designed for high - horsepower engines, so make sure your engine setup can handle the power. And always use high - quality lubricants to ensure smooth operation and longevity of the pistons and rings.