Holley EFI 300-680BK-100K Ultra Lo-Ram Intake Manifold Kit with Throttle Body Injectors - LS3 102mm 100lb Black

The Holley EFI 300-680BK-100K is a complete LS3 Ultra Lo-Ram intake manifold combo kit finished in black powder coat, bundling the Ultra Lo-Ram intake manifold with a 102mm throttle body and 100 lb/hr fuel injectors — everything needed to build a high-performance forced induction LS3 intake system in a single purchase.

Engineered specifically for boosted applications, the Ultra Lo-Ram's exceptionally low profile is purpose-built to maximize hood clearance in supercharged and turbocharged builds. The base manifold stands just 5.17 inches at the plenum mounting flange, rising to 6.86 inches with the throttle body adapter installed — low enough to clear even the aggressive hoodline of a C6 Corvette without modification.

Key Features:

• Designed for GM LS Gen III and IV engines with LS3/L92 cylinder heads (OE or aftermarket)
• Optimized for forced induction (supercharged or turbocharged) with peak power at 7,000–8,000 RPM
• Front-entry plenum with 105mm flange opening accommodates custom throttle body adapters and inlet ducts
• Includes 102mm throttle body for maximum airflow in high-power applications
• Includes 100 lb/hr fuel injectors for high-horsepower forced induction fuel demands
• Single injector port configuration per cylinder
• High-volume fuel rails with 8 AN (3/4-16) O-ring ports and mounting hardware included
• Fuel rail brackets accommodate both standard-length and short injectors (e.g., Pico or LS7 style)
• Plenum top features a machined flange for an optional 6-1/8" x 3-1/8" burst panel (not included)
• Modular design supports fabrication of custom throttle body adapters or inlet ducts
• Black powder-coated finish for a clean, durable appearance under the hood

The Ultra Lo-Ram's modular construction gives builders maximum flexibility for custom installations while keeping overall height to a minimum. Compatible with OE and aftermarket LS3/L92 cylinder heads, this kit is intended for race and uncontrolled (non-emissions) vehicle use.