ARP 125-4001 Head Stud Kit for BUICK 455 hex ymm_34 and remapping the ECU is

and remapping the ECU is mandatory when it is fitted

It is a must for users who want highly accurate oil or fuel pressure readouts in their high performance vehicle

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

5 inlet and M12x1

ARP 125-4001 Head Stud Kit for BUICK 455 hex ymm_34 and remapping the ECU isPro 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