S3 BETA EVO CYLINDER HEAD COVER AND INSERTSS3 Cylinder heads can hold more water flow and have stronger walls, helping with the cooling rate, this improve low and high revs power. Amazing Racing look! S3 heads are made by forging process and using best alloys available then anodisedSpecific compression inserts design offers the possibility to adapt engine setting to YOUR CHOICETo be used in conjunction with either high or low compression S3 cylinder head insert or own its own. Choose options