The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifold and rail kits will work with OE or aftermarket cylinder heads.

The 300-604 is the plenum top in the 300-621BK complete kit. Offering this separately allows you to select your components individually as you build your system.

The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm throttle body part number 112-581 or similar models. The base intake manifold is designed with a lower overall height to fit under a stock or mildly modified hood in the front-feed configuration. The 300-621 Ultra Lo-Ram plenum entry was configured to provide a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. The fuel rail kits come with two sets of brackets. A set for long (usually standard length) fuel injectors and a set for short (such as Pico, or LS7) fuel injectors.

Features

• Plug and play GM Gen V LT engine control including GDI and VVT support
• Ideal for swapping late model GM Gen V LT engines into vintage vehicles
• 3.5‚Äù handheld gets your engine running in no time with a step-by-step calibration wizard
• GM LS and LT Drive-by Wire Throttle Body Control (Terminator X Max Only)
• GM 4L60 and 4L80 Transmission Control (Terminator X Max Only)
• Included engine harness plugs directly into the factory LT DI injector sub harness
• OEM Injectors supported, with part numbers provided in the handheld wizard, or software
• Genuine Bosch LSU 4.9 Wideband Control (Will not work with LSU 4.2 Oxygen Sensors)‚Ä¢ Genuine Bosch LSU 4.9 Wideband Control (Will not work with LSU 4.2 Oxygen Sensors)
• On-Board Diagnostic LEDS for: ECU Power ‚Äì Engine Run ‚Äì Wideband Status ‚Äì TPS Calibration ‚Äì Crank Signal ‚Äì Cam Signal ‚Äì VVT Status ‚Äì Pump Control ‚Äì and DI Injectors. Allowing you to identify any Critical engine issues at a glance
• Built in 1bar MAP Sensor, vacuum hose adapters included (1/8th ‚Äì ¬º and 3/16ths) - or for Boosted applications, you can disable the internal MAP sensor, and utilize an external LT MAP Sensor, the harness comes with the connector terminated, making the inst
• 4 Inputs ‚Äì 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake (Fuel and Oil Pressure Inputs are pre-terminated)
• 4 Outputs ‚Äì Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and more
• Boost Control ‚Äì Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
• Nitrous Control ‚Äì Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
• Advanced Tables ‚Äì 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table
• Integrated data logging to the 3.5‚Äù Handheld SD Card
• Free EFI Tuning Software for complete control of your Terminator X power plant