These Manley pistons are perfect for Mitsubishi Evo X owners who want to boost their engine's power. They're great for car enthusiasts and racers looking for better performance. The pistons have an 86mm STD bore and a 9.0:1 dish design. They fit 2008, 2010 - 2014 Mitsubishi Lancer Evolution GSR and MR, as well as 2010 - 2011 Evolution MR Touring models.