The Edelbrock Performer 5. 8 EFI (Electronic Fuel Injection) Intake Manifold can be used with the Edelbrock's twin throttle body 350-3837. This manifold made 34 foot / pounds more torque than stock on our test engine. The intake section includes plenum only and is at the upper part. The modular design incorporates the latest airflow technology and CAD programming for maximum power gains up to 37 horsepower at 5, 500 RPM with no loss of low speed torque. This manifold features a broad power range from idle to 5, 500 RPM. The removable plenum cover allows access to runners for modification; and base manifold is CNC port matched to upper manifold for maximum performance. The upper and plenum cover are powder-coated light titanium gray. The base is as-cast and not powder-coated.