These pistons are perfect for car enthusiasts looking to upgrade the performance of their 2002 - 2005 Subaru Impreza WRX or 2005 Saab 9 - 2X Aero. In high - performance driving scenarios, such as racing or aggressive street driving, these pistons really shine. They have a STD stroke of 92mm and a STD bore with an 8.5:1 dish, and are made from 2618 alloy forgings, which ensures they can handle the stress of high - powered engines.