ARP 125-4001 Head Stud Kit for BUICK 455 hex ymm_34 the optional Akrapovič Sound Kit

the optional Akrapovič Sound Kit P-HF1177 is not needed - specially developed Akrapovič Sound Kit is already included within the evolution link pipe set

and remapping the ECU is mandatory when it is fitted

The rounded "nose" and the linear hexagonal part serve as a guide to the nut

adding this sporty stainless-steel front link pipe set takes the Evolution Line to greater levels

ARP 125-4001 Head Stud Kit for BUICK 455 hex ymm_34 the optional Akrapovič Sound KitPro Series Hex Cylinder Head Stud Kit by ARP. Designed utilizing the latest technology, this product by ARP features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed stringent industry standards Specifications Socket Size(s) 3 4 hex, 3 16 Allen Kit Instructions