SKU: 59839583273

Holley LS1/LS2/LS6 Ultra Lo-Ram EFI Intake Manifold, Black Finish (HO300-621BK)

Sale price$1087.65 Regular price$1208.50
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Description

Holley LS1/LS2/LS6 Ultra Lo-Ram EFI Intake Manifold, Black Finish (HO300-621BK)HO300 621BK BLACK HOLLEY MODULAR LO RAM Suit Single GM 105mm Throttle Body Part Number: HO300 621BK 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 manifolds will work with OE or aftermarket cylinder heads. The Ultra Lo Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the

HO300-621BK - BLACK HOLLEY MODULAR LO-RAM

Suit Single GM 105mm Throttle Body

Part Number: HO300-621BK

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 manifolds will work with OE or aftermarket cylinder heads. 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. 
The 300-621 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:
Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral cylinder heads
Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used
Modular design allowing the use of front-feed plenum entry

Intake design facilitates custom inlet duct and throttle body placement

Low height to fit under a stock or mildly modified hood in the front configuration
Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 59839583273

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Verified Purchase
Randy B.
Omaha, US
★★★★★ 5
OEM Quality.
Exact fit.
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Reviewed in the United States on April 7, 2026
R
Verified Purchase
Rick Ivy
Alexandria, US
★★★★★ 5
Quality
Quick shipping and good quality materials.
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Reviewed in the United States on December 1, 2025
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Verified Purchase
Donna M. Kovalick
Houston, US
★★★★★ 5
Perfect fit!
Perfect fit!!
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Reviewed in the United States on October 5, 2025
T
Tim
Charlottesville, US
★★★★★ 5
Good quality fits 2025 Civic Hybrid
The filters are good quality. I did not find any instructions, but then again, the tube is full of them. Compaitble with 2025 Civic Hybrid. The engine filter have a bit of a chemical smell, but the air cabin filter does not. The cabin filter has an interesting yellow color.
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Reviewed in the United States on February 13, 2026
S
slwf
Grantham, US
★★★★★ 4
Quality filters for a decent price
The engine filter is model # JMAJ20. I am not sure of the cabin filter model #. I have a 2026 Honda CRV Hybrid 2.0L Sport Touring. These should fit as almost everything matches between the 2025 and 2026. I have not yet needed to swap the filters in the new vehicle. These filters will be stored for future replacement. The filters appear to be well made. This is a decent price fortwo filters. The engine filter's gasket is a little wavy but it should be ok to form fit once inserted into the car. The engine filter is in a retail box without a plastic wrapper but the cabin filter is just a plain cardboard box inside a plastic wrapper. This might be challenging to remember what is in the box later once the filter needs to be replaced unless I write the information onto the box. I am unsure if the lack of a wrapper for the engine filter will affect the filter while stored. I did not notice a smell to these but I am not sensitive to smell. I would get these again.
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Reviewed in the United States on October 14, 2025

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