Granatelli MEGAZILLA Black Billet LS Intake Manifold – Twin 103mm Inlets – 980103

Built to order — ships in 6–8 weeks. Each MEGAZILLA is machined to order.

Want the throttle bodies too? Get the MEGAZILLA + Twin 103mm Throttle Body Package with your choice of Malevolent Series cast black, black billet or silver billet throttle bodies.

Granatelli Motor Sports MEGAZILLA Black Billet LS Intake Manifold – Twin 103mm Inlets

When maximum airflow is the goal, the Granatelli Motor Sports MEGAZILLA Twin 103mm LS Intake Manifold delivers the capacity serious high-horsepower combinations demand. Machined from premium billet aluminum, the MEGAZILLA is engineered for extreme LS street, drag racing and competition applications where strength, airflow and consistency are critical.

Featuring two massive 103mm throttle-body inlets, a large high-flow plenum and optimized runner layout, the MEGAZILLA is designed to move an exceptional volume of air while supporting strong cylinder filling and mid-to-high RPM horsepower. It is an excellent choice for extreme naturally aspirated engines as well as high-boost turbocharged and supercharged LS builds.

What You Need to Finish the Setup

• Included: MEGAZILLA manifold with fuel rails
• Two 103mm drive-by-wire throttle bodies (sold separately): GMTBLS3M Malevolent Series cast black, GMTBLS3B black billet or GMTBLS3 silver billet — or save the hassle with the package
• A 2-to-1 drive-by-wire throttle body adapter harness to run both throttle bodies (not sold by Granatelli Motor Sports)
• A tune after installation

MEGAZILLA Airflow: This manifold uses TWIN 103mm throttle-body inlets. This is not a single-inlet ZILLA manifold. It is designed for extreme high-airflow LS applications.

Twin 103mm Inlets for Extreme Airflow

Two 103mm throttle-body openings give the MEGAZILLA enormous airflow potential for LS combinations that have exceeded the practical limits of conventional single-throttle-body intake systems. The dual-inlet configuration is designed to feed the large plenum efficiently and support the airflow demands of large-displacement, high-RPM and heavily boosted engines.

Key Features

• Twin 103mm throttle-body inlets for extreme airflow capacity
• Precision-machined from premium billet aluminum
• Exceptional strength and rigidity for demanding race applications
• Large high-flow plenum designed for high-horsepower LS combinations
• Optimized runner layout for efficient cylinder filling
• Designed to support strong mid-to-high RPM power
• Engineered for extreme naturally aspirated LS builds
• Rated to 45 psi of boost for turbocharged combinations
• Excellent for high-output supercharged LS engines
• Designed for serious street, drag racing and competition use
• Billet construction provides excellent heat stability
• Black anodized finish for durability and a premium stealth appearance
• Precision-machined for clean, professional installation
• Made in the USA

Designed for High-Horsepower LS Engines

As LS engines increase in displacement, RPM capability and boost pressure, airflow demand rises dramatically. Eventually, a conventional single throttle body and smaller plenum can become a significant restriction.

The MEGAZILLA is engineered specifically for these serious combinations. Its twin-inlet configuration feeds a large-volume plenum designed to provide the airflow capacity needed by engines operating well beyond factory power levels.

Built for Boost: Rated to 45 psi

High-boost turbocharged and supercharged engines place tremendous demand on an intake manifold. Increased airflow, pressure and engine speed require a manifold with both exceptional flow capability and structural strength.

The MEGAZILLA is rated to a maximum of 45 psi of boost. Its billet aluminum construction provides the rigidity and durability required for serious forced-induction combinations, while the dual 103mm inlet arrangement gives builders the airflow capacity needed for extreme horsepower.

High-Flow Plenum & Optimized Runner Design

Moving a large volume of air into the manifold is only part of the equation. The MEGAZILLA uses a large high-flow plenum and optimized runner layout to help distribute incoming airflow effectively across the engine.

This performance-focused design promotes improved cylinder filling, responsive airflow and strong mid-to-high RPM power—exactly what is needed in serious race-oriented LS combinations.

Ideal For

Vehicle Fitment: Direct-Fit Applications

The MEGAZILLA is for GM LS engines with square-port (LS3/L92-style) cylinder heads. It fits the same factory LS3, L99 and L76 applications as the ZILLA:

Vehicle Fitment: Australian Holden & HSV Applications

Australian build dates and model-year labels can overlap. Match the series and engine code, especially during changeover years.

MEGAZILLA FAQ

Are throttle bodies included?
No. The MEGAZILLA takes two 103mm drive-by-wire throttle bodies, sold separately or together in the MEGAZILLA + Twin 103mm Throttle Body Package.

What else do I need to run two throttle bodies?
A 2-to-1 drive-by-wire throttle body adapter harness. Granatelli Motor Sports does not sell this harness.

Are fuel rails included?
Yes.

Which cylinder heads does it fit?
Square-port (LS3/L92-style) heads — LS3, L99 and L76 engines. See the fitment tables above.

How much boost will it handle?
The MEGAZILLA is rated to 45 psi.

Do I need a tune?
Yes. A tune is required after installation.

How long until it ships?
Each MEGAZILLA is built to order and ships in 6–8 weeks.

Product Details

Brand: Granatelli Motor Sports

Product Line: MEGAZILLA

Part Number: 980103

Product Type: High-Performance LS Intake Manifold

Throttle Body Configuration: Dual / Twin Inlet

Throttle Body Inlet Size: Twin 103mm

Throttle Bodies: Not included (two 103mm DBW required)

Cylinder Head Port Style: Square port (LS3/L92-style)

Material: Billet Aluminum

Finish: Black Anodized

Fuel Rails: Included

Engine Platform: GM LS

Naturally Aspirated Compatible: Yes

Turbocharged Compatible: Yes

Supercharged Compatible: Yes

Maximum Boost: 45 psi

Lead Time: Built to order, ships in 6–8 weeks

Recommended Use: Extreme Street / Drag Racing / Competition

UPC: 802735047899

Country of Origin: Made in the USA

Fitment questions? Call Granatelli Motor Sports at 1-805-486-6644, Monday–Friday, 8am–5pm PST. A tune is required after installation.