Description
Product Overview
Give your 4.0L Jeep the low-end grunt it deserves. This 4-bolt throttle body spacer increases intake plenum volume, creating a venturi effect that accelerates airflow into the intake manifold. The result? Improved throttle response, better fuel atomization, and a noticeable bump in low-to-mid-range torque — exactly where you need it for rock crawling, trail riding, and daily driving.
Designed for all 1987-2006 Jeep Wrangler (TJ, YJ), Cherokee (XJ), and Comanche (MJ) models with the legendary 4.0L AMC inline-6 engine. CNC-machined from 6061-T6 billet aluminum for a lifetime of service. Includes high-temperature gaskets and all mounting hardware.
Key Features
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CNC-Machined 6061-T6 Billet Aluminum — Precision-machined for a perfect port-match to your factory throttle body. Won't warp, crack, or degrade like plastic spacers.
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Helix Bore Design — Spiral-cut internal bore creates a vortex effect that improves air-fuel mixing and combustion efficiency.
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Low-End Torque Boost — Extends effective intake runner length for a +8-12 ft-lbs torque gain in the 1,500-3,500 RPM range where you actually drive.
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Complete Kit — Includes 1x spacer, 2x high-temperature gaskets, 4x extended bolts, thread locker, and installation instructions.
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No Tune Required — Works with factory ECU. Just bolt on, start up, and feel the difference on your next drive.
Compatibility
| Year |
Make |
Model |
Engine |
| 1987-1995 |
Jeep |
Wrangler YJ |
4.0L I6 |
| 1997-2006 |
Jeep |
Wrangler TJ |
4.0L I6 |
| 1987-2001 |
Jeep |
Cherokee XJ |
4.0L I6 |
| 1987-1992 |
Jeep |
Comanche MJ |
4.0L I6 |
Specifications
| Spec |
Value |
| Material |
6061-T6 Billet Aluminum |
| Thickness |
1 inch |
| Bore Style |
Helix / Spiral |
| Bolt Pattern |
4-Bolt (OEM Standard) |
| Finish |
Anodized |
| Gasket Type |
High-Temp Composite |
Why Choose iFJF
Unlike cheap eBay spacers made from mystery metal, this throttle body spacer is CNC-machined from aerospace-grade 6061-T6 aluminum to exacting tolerances. The helix bore is a proven design used in performance applications for decades. Backed by our satisfaction guarantee and US-based customer support.
Frequently Asked Questions
Q: Will this throttle body spacer fit my 2003 Jeep Wrangler TJ 4.0L?
A: Yes. This 4-bolt 1068 throttle body spacer is designed for all 1987-2006 Jeep Wrangler TJ, YJ, XJ Cherokee, and MJ Comanche with the 4.0L inline-6 engine. It's a direct bolt-on with no modifications required.
Q: What performance gains can I expect?
A: Most users report 5-10 HP and 8-12 ft-lbs of torque gain at the low-to-mid RPM range. The spacer creates a longer intake runner effect, improving air velocity and fuel atomization for better combustion efficiency. Expect a noticeable improvement in throttle response and low-end grunt.
Q: Do I need a tune after installing this spacer?
A: No ECU tuning is required. The factory ECU adapts to the slightly altered airflow within a few drive cycles. If you have other mods (cold air intake, exhaust), a tune can maximize gains but is not necessary.
Q: Will this cause any check engine lights?
A: No. This is a simple mechanical bolt-on that does not affect emissions equipment or sensors. It will NOT trigger a CEL. Install it in under 30 minutes with basic hand tools.
Q: What material is the spacer made of?
A: CNC-machined from 6061-T6 billet aluminum with an anodized finish for corrosion resistance. Unlike plastic spacers that can warp under engine heat, this aluminum spacer maintains its shape and seal integrity for the life of your vehicle. Includes high-temperature gaskets for a leak-free seal.
