- Improved Throttle Response

They are constructed using premium materials such as ARP2000

use an ARP chaser to chase the threads

This is especially important for high-performance

Eliminates timing inconsistencies and crank spin

B58 Gen1 Intake Manifold 11121726619 - Improved Throttle ResponseRK 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.