Cylinder Liner set for high tune of SR20DET. SR20 engine have aluminum block which is not strong enough to withstand the condition for high power tuning. These sleeves can provide the necessary strength and has been designed to match the piston rings in the most efficient manner. For maximum results, HKS recommends using SR20DET 2.2L kit (21004-AN001, AN015) with this product. This product is compatible with both 86mm and 87mm pistons for flexible application.