Holley EFI 300-621BK-120K Ultra Lo-Ram Intake Manifold Kit with Throttle Body Injectors - LS1/LS2/LS6 Black 102mm 120lb

The Holley EFI 300-621BK-120K is a complete Ultra Lo-Ram EFI intake manifold kit for GM LS Gen III and IV engines, bundled with a 102mm throttle body and 120 lb/hr fuel injectors. Engineered specifically for forced induction builds, this all-in-one kit delivers everything needed to complete your LS induction system in a single purchase.

The Ultra Lo-Ram manifold features a front-feed plenum design configured for a very low overall profile, making it ideal for turbocharged and centrifugally supercharged applications where hood clearance is a concern. The low-height design fits under a stock or mildly modified hood, and the modular construction allows for custom inlet duct and throttle body placement to suit a variety of engine bay configurations.

Key Features:

• Designed for GM LS Gen III and IV engines with LS1/LS2/LS6 cathedral port cylinder heads
• Compatible with OE and aftermarket cylinder heads
• Ultra-low profile front-feed plenum for turbocharged and centrifugally supercharged engine applications
• Modular cast aluminum construction in black finish
• High-volume fuel rails included with 3/4 in.-16 O-ring ports (8 AN)
• Fuel rail kit includes two sets of injector brackets — one for long (standard length) injectors and one for short injectors (Pico, LS7, etc.)
• Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
• Short runner design pairs peak power RPM to the output of your supercharger or turbocharger
• Front entry plenum flange allows fabrication of custom throttle body adapters or inlet ducts

Kit Includes:

• Holley Ultra Lo-Ram EFI Intake Manifold — Black (300-621BK)
• 102mm Throttle Body — Black
• High-volume fuel rails and mounting hardware
• Dual injector bracket sets (long and short injector compatible)

This kit is intended for race and off-road use on non-emissions-controlled vehicles only. It is not legal for use on emissions-controlled street vehicles in all states.