Spectre Plenum - Single (Low Profile) - 98499

The Spectre Performance 98499 Low Profile Single Air Intake Plenum is a polished cast aluminum plenum designed for carbureted engines and TBI (throttle body injection) setups that demand more hood clearance. Built for 4-inch diameter intake systems, it accepts a single 4-inch inlet and sits at just 2.4 inches tall between the carburetor and the bottom of the hood — making it an ideal solution when a standard-height air cleaner simply won't clear a low hood line. Whether you're building a street rod, muscle car, or custom engine bay, this plenum delivers clean airflow and a show-quality finish without sacrificing fitment.

Key Features & Benefits

• Polished Cast Aluminum Construction: Durable aluminum build provides long-lasting corrosion resistance and a show-quality polished finish that stands out in any engine bay.
• Low Profile Design (2.4" Tall): At only 2.4 inches in height between the carburetor and hood, this plenum is purpose-built for tight engine compartments where a standard air cleaner assembly won't fit — no more hood clearance headaches.
• Single 4-Inch Inlet: The 4-inch single inlet is designed to match up directly with all Spectre 4-inch intake tubing, making it straightforward to integrate into an existing or new Spectre intake system.
• Fits Carburetors and TBI Throttle Bodies with 5-1/8" Inlet: Designed specifically for carburetors and TBI throttle bodies that have a 5-1/8-inch neck, covering a wide range of classic and performance applications.
• Designed for 4-Inch Intake Systems: Engineered to work seamlessly within a 4-inch intake system, ensuring a proper seal and optimized airflow without adapters or modifications.
• Clean, Universal Styling: The polished finish and low-profile shape work equally well on custom builds, hot rods, classic trucks, and muscle cars where aesthetics matter as much as function.

Specifications

• Manufacturer Part Number (MPN): 98499
• Brand: Spectre Performance
• Material: Cast aluminum
• Finish: Polished aluminum
• Design: Single inlet, low profile
• Inlet Diameter: 4 inches (single inlet)
• Carburetor / Throttle Body Neck Size: 5-1/8 inch inlet
• Height: 2.4 inches (between carburetor and hood underside)

Fitment

The Spectre 98499 plenum is a universal-fit component — it is not vehicle-specific. It is compatible with carburetors and TBI (throttle body injection) throttle bodies that feature a 5-1/8-inch inlet. It is designed to work with 4-inch diameter intake tubing, and specifically matches up with Spectre's own 4-inch intake tube lineup. This makes it suitable for a wide range of classic muscle cars, hot rods, street rods, trucks, and custom builds running a carburetor or TBI-style induction system with the appropriate neck size. If your carburetor or throttle body does not have a 5-1/8-inch inlet, this plenum will not fit correctly — confirm your carburetor's air inlet diameter before ordering.

Why Buy from ThreePiece.us

At ThreePiece.us, we make it easy to get the right parts the first time. Have a fitment question about the Spectre 98499 before you order? Our team is here to help you confirm compatibility with your specific carburetor or TBI setup. Every order ships free, and if you'd rather spread out the cost, Affirm financing is available at checkout — so you can build your intake system now and pay over time.

Frequently Asked Questions

What size carburetor or throttle body does the Spectre 98499 fit?

This plenum is designed to fit carburetors and TBI throttle bodies with a 5-1/8-inch inlet. Make sure to measure your carburetor's air horn opening before ordering to confirm compatibility.

What size intake tubing does this plenum accept?

The Spectre 98499 has a single 4-inch inlet, designed to match Spectre's 4-inch intake tubing. If you're running a different diameter intake tube, you'll need an appropriate adapter or a different plenum model.

How tall is this plenum, and why does that matter?

This plenum measures 2.4 inches tall between the carburetor and the underside of the hood. That low-profile design is the key selling point — it's built specifically for engine bays where hood clearance is limited and a standard-height air cleaner assembly won't fit.

Is this a complete air intake kit, or just the plenum?

This is the plenum only (single low-profile unit). It is not a complete cold air intake kit. You will need to pair it with compatible 4-inch intake tubing, a filter, and any other hardware required for your specific application.