Throttle Body Spacer for Jeep Wrangler (1991-2006) 2.5L 4.0L

Billet Aluminum Throttle Body Spacer for 1991-2006 Jeep Wrangler

Direct-fit induction upgrade: Lengthens the intake tract between the throttle body and intake manifold to increase plenum volume, improve air velocity, and sharpen throttle tip-in response on trail and street applications.

The Stock Wrangler Intake Airflow Restriction

Factory AMC inline engines feature an abrupt transition between the throttle body bore and the cast aluminum intake plenum. This interface creates boundary layer separation and turbulence at low engine speeds, manifesting as sluggish throttle tip-in and delayed torque delivery during low-RPM rock crawling or hill climbs. Factory mounting hardware is also prone to thread fatigue and corrosion over decades of severe thermal cycling.

The Engineering Solution

CNC-machined from aircraft-grade 6061-T6 billet aluminum, this spacer introduces an optimized bore profile that straightens incoming airflow and stabilizes intake velocity into the runner runners. The anodized surface finish prevents galvanic corrosion and resists heat soak in high-temperature engine bays. Packaged with heavy-duty 304 stainless steel fasteners, it maintains clamping force across the mating flange to prevent unmetered vacuum leaks.

Technical Specifications

Compatibility

• 1991-1995 Jeep Wrangler YJ (2.5L I4 AMC 150, 4.0L I6 AMC 242)
• 1997-2006 Jeep Wrangler TJ (2.5L I4 AMC 150, 4.0L I6 AMC 242)

The Jeep Trail Standard

Engineered for high-vibration off-road duty, this solid billet spacer withstands severe trail abuse, sustained crawling temperatures, and heavy low-end load demands without warping or cracking.