This piston set is perfect for car enthusiasts looking to upgrade their engine performance. Ideal for use in Saab 9 - 2X Aero (2005) and Subaru Impreza WRX (2002 - 2005). It has a 79mm +4mm stroker and 92mm STD bore, with a 8.5:1 dish design. The set comes with rings and offers a great balance of power and durability.