MSD LT1 Atomic AirForce 103mm Intake. These all new MSD Atomic AirForce intake manifolds have been designed using Computational Fluid Dynamic Modeling to create optimal plenum volume and efficient paths for improved air flow and minimize shrouding - efficiently using the available plenum volume for an unobstructed flow path over opposing runners. The 2-piece molded polymer design resists heat soak, minimizes weight and allows easy access to the runners for porting. MSD Atomic AirForce intake manifolds accept greater accept an OEM or 103mm throttle body, as well as stock, aftermarket or Atominc LS EFI fuel rails. Molded bosses provide the ability to add nozzles for nitrous system. They're supplied with new gaskets and hardware fora direct bolt-on package. The 103mm throttle bore allows the use of large throttle bodies for greater airflow, and a direct-flow path runner design promotes maximum airflow.