The H22 doesnt have traditional sleeves. The are a Carbon/Aluminum Alloy sleeve and can't be bored by much. The stock sleeves need specially coated forged pistons that run around $800 a set from Mahle and the motors don't hold high boost well. If you plan on putting down some big numbers send the block out to be sleeved by a company like golden eagle. Then you can run traditional forged pistons without any problems and reliably Hold the power. Any more questions on the H22 feel free to PM me.