Elevate your engine’s performance with the Speedmaster Downdraft EFI Stack Intake Manifold Systems—designed for drivers who demand both power and precision. These systems deliver crisp, race-inspired EFI performance, capable of supporting up to 1,000 horsepower in demanding applications.

At the heart of the design are precision-cast aluminum, 50 mm IDA-style throttle bodies that supply optimal fuel and air, resulting in superior idle characteristics and lightning-fast throttle response. The downdraft configuration improves airflow efficiency, promoting better mixture control, tighter emissions, and enhanced air/fuel ratio economy—ideal for both street builds and high-performance setups.

This intake manifold system provides the visual appeal of classic individual throttle setups with the modern efficiency of electronic fuel injection—perfect for enthusiasts who want the best of both worlds. The included intake trumpets and fuel rails ensure a more complete installation package without sacrificing style or functionality.

Whether you’re shopping for a standout 8 stack fuel injection setup, a refined stack efi solution for your muscle car, or a robust speedmaster stack injection system to unlock serious horsepower, this manifold system ticks every box.

Refine your build with a system that’s as capable as it is captivating. Choose Speedmaster’s Downdraft EFI Stack Intake Manifold for unmatched throttle response, refined airflow control, and the confident performance boost your engine deserves.