use an ARP chaser to chase the threads

Replace the included insert as needed for greater longevity and maintenance

vouching for their reliability

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B58 Gen1 Intake Manifold 11121726619 use an ARP chaser toRK Autowerks B58 RK Billet Port Injection Manifold GEN1 This manifold is designed for plug and play fitment using OEM mounting points. Please note that if you are not using port injection, you will need to purchase blanks. Precision Raceworks sells the blanks very cheap. RK Autowerks is known for their no compromise engineering, and this manifold is a direct result of meticulous design refinement, race tested development, and a commitment to quality.