GM LS3 L98 Rectangle Port Hi Rise EFI Modular Intake Manifold

Introducing the Aeroflow Performance GM LS modular intake manifold engineered for LS3/L98 rectangle port heads. This hi-rise, cast aluminium manifold in a natural finish delivers real-world performance gains with a flexible, customizable design. It’s built to accommodate a 102mm or 105mm throttle body and 14mm short injectors, making it a versatile choice for street, strip, and high-performance street/drag applications.

Key features and benefits

• Modular architecture: bottom base bolts to the cylinder heads and top plate seals with an O-ring, with each base compatible with either cathedral port or rectangle port cylinder heads. This allows you to tailor the setup to your specific head configuration and airflow goals.
• Hi-rise performance with optional bonnet clearance: long runner design supports high RPM horsepower on big-cube builds, while Aeroflow also offers a low-rise option for stock bonnet compatibility. This manifold is the hi-rise variant requiring bonnet clearance checks before installation.
• Rectangle port precision: port size 1.15" x 2.50" designed to optimize airflow distribution across all eight cylinders, improving throttle response and power delivery.
• Throttle body compatibility: top plate features a short snout to accept a 102mm GM LS four-bolt throttle body; supports up to 105mm in chassis configurations where applicable.
• Backfire protection: welded burst panel on the top plate releases pressure (200 psi) in the event of a backfire, safeguarding the intake system and engine components.
• MAP sensor and port provisions: rear LS style MAP sensor provision, plus 3/8" NPT port (x1) and 1/8" NPT port (x1) for auxiliary sensors or vacuum/boost connections.
• EFI or non-EFI options: choose between non-EFI with no injector bosses or EFI with 16 injector bosses (8 undrilled) and complete with fuel rails and crossover, designed to suit 14mm short length (33mm) fuel injectors.
• Finish options: available in natural cast or black powder coating to match your build and under-hood aesthetic.
• What’s included: the manifold ships with a complete fuel rail kit (AF6999-6004), 8 x intake manifold O-ring gaskets (AF6233-5002), 8 x M6 x 1.00mm hex screws (45mm UHL), 8 x M6 flat washers, and port plugs (one 3/8" NPT steel plug and one 1/8" NPT steel plug). The gasket O-ring for the manifold is AF6999-1000.
• Modularity and upgrade path: the design supports purchasing complete manifolds or individual components, enabling you to upgrade injector configurations, fuel rails, or ports as your build evolves.

Why choose this modular LS manifold?

• Tailor airflow to your application with a base/top-plate modular approach, ensuring compatibility with both cathedral and rectangle port heads.
• Maximize throttle response and high-rpm performance with short intake runners and a hi-rise design optimized for big-cube LS engines.
• Benefit from integrated fuel rails, injector bosses, and cross over flexibility, while retaining the option to run a traditional EFI setup or a compact non-EFI arrangement.
• Protective features like the burst panel add race-ready reliability by safeguarding the intake in backfire scenarios.

Designed to meet the demands of performance enthusiasts who require precise fitment, reliable sealing, and scalable intake solutions for the GM LS engine family, this EFI Modular Intake Manifold from Aeroflow Performance brings flexibility, efficiency, and proven airflow benefits to your LS3/L98 build.