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98261 Spectre Plenum Kit

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Spectre's Over-The-Top Air Intake Plenums are fabricated from high quality polished aluminum sheet metal. This plenum requires a minimum of 4-1/4 inches between the throttle body and the fan or radiator, and 7-1/4 inches from the centerline of the throttle body to the underside of the hood. This Spectre air intake plenum features a 4 inch single inlet and is designed to match up to Spectre 4 inch tubing, filters, and accessories allowing you to design your very own custom cold air intake system.
  • Fabricated from high quality polished aluminum sheet metal, this plenum is designed for Chevrolet LS engine swaps where space in the front of the engine compartment is limited
  • Requires 4.25 inches minimum clearance between the throttle body and the fan or radiator in front of the engine and 7.25 inch minimum from centerline of the throttle body to the underside of the hood
  • Over the top design mounts the plenum over the top of the intake manifold and draws air in from the back of the engine compartment
  • The mass air flow sensor can be booted in between the plenum and the filter above the manifold, mass air flow sensor is not included
  • Bracket attachment points provided; bracket fabrication is required
  • 4 inch single inlet is designed to match up to all Spectre 4 inch tubing, filters and accessories
Warranty90 Days
Product StyleSpectre Plenum Kit
Length16 in (406 mm)
Outside Diameter4 in (102 mm)
Package Contents1 Plenum
Package Quantity1
Weight4.3 lb (2 kg)
Product Box Height8.3 in (211 mm)
Product Box Length18.1 in (460 mm)
Product Box Width12.5 in (318 mm)
Material UsedAluminum
No cross references found for this part
DIY Level

Advanced Moderate Easy

Tools Needed


Installation Time

20 Minutes


Installation PDF

Spectre Drawings

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From humble beginnings in a two car garage, to setting world records and becoming the first wheel driven, gasoline powered car to run over 400 mph, it's been one heck of a ride.

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