The 6 Best 4.0 Throttle Body Spacers (2023 reviews)

The latest ifjf 4.0 throttle body spacer is an absolute beast in terms of its features, and rightfully takes the top spot with ease. There is an intriguing whistle at a certain throttle position. It fits models with 4.0l/ 2.5l engines and only fits 4-bolt throttle bodies. The spacer works by adding to the available air mass in the intake behind the throttle body. It is easy to install, adding punch to the low end.

The idle is smoother than it has ever been in. There is a air leak on the throttle body or a vacuum line. It is used to lag in the higher rpms.

Why We Like This:

Easy bolt on good quality parts
One of the new comers and featured product

Best Runner up: Airaid 4.0 Throttle Body Spacer

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Here, we present spacer that manages to win our hearts. It's the airaid 4.0 throttle body spacer and it's widely considered as one of all-around great spacer you can buy. The airaid throttle body spacer is designed to enhance off throttle response. It is installed in conjunction with a k&n cold air intake kit. It includes gaskets, hardware and precision brackets. It does make a whooshing or whistling sound. The combination of cai and this spacer provide a noticable improvement. It increases the performance of the engine combined with a cold air intake and great response at the foot it really sounds good to. It does whistle when giving it moderate throttle. It is fast and easy to install.

Why We Like This:

Idle torque from 800 rpm to approximately 3, 000 rpm
Easy install and do feel a power difference at low end
Easy to install and solid product and hardware

Best With Jeep Wrangler: POSENG 4.0 Throttle Body Spacer

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The poseng 4.0 throttle body spacer's superior materials makes sure that it ages well with use. The throttle body spacer replacement for jeep wrangle and cherokee features to be heavy duty, stable.

Why We Like This:

Good investment for long term
New and hot release

Best value For money: AFE Power 4.0 Throttle Body Spacer

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Not everyone likes to purchase spacer for their daily usage, but the afe power 4.0 throttle body spacer would be an anomoly. The Serrated/Helix combination design also reduces intake whistle that occurs with other helix only designs. It has a design for optimum airflow into the combustion chamber. The silver bullet throttle body spacer is constructed from precision machined. It comes with longer bolts and also it is a 92mm large mouth. It will whistle a little bit in hard throttles. Install is great and easy, and instructions are straight forward and really easy.

Why We Like This:

Smooth sound and instant horsepower change when revving
Improved throttle response and shifted nicely
Delivers what they promise

Best Mileage: Airaid Throttle Body Spacer

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Compared with other spacer in this category, the airaid throttle body spacer has a convenient design. This item is only effective if you use it conjunction with an intake manifold spacer, cai (k&n or volant), and jet powerflo maf sensor. It features a dyno-proven “helix bore that causes a spinning action of the incoming air-charge as it passes through the throttle body spacer. It is made to turbulate the air for a better burn during combustion.

These helix bores cause a spinning action of the incoming air-charge as it passes through the throttle body spacer. It is not very loud (which is nice) but at the right RPM's (2, 600-3, 400) it sounds great. It includes hardware for easy installation.

Why We Like This:

Highly recommend for a quick and easy upgrade
Looks awesome in the engine bay
Throttle has quicker response that you can hear and feel

Best Feature: Easy to Install: AFE 4.0 Throttle Body Spacer

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The gasket goes between the spacer and throttle body under the spacer is the oem o ring that seals the bottom of the spacer. It has a design for optimum airflow into the combustion chamber. It gets you off the line quicker with no lag.

The large diameter of each hole allows the entire spacer to move or be mounted in such a way that the throttle blade will hit the throttle plate not allowing the blade to open completely as it should. It goes between the throttle body and the spacer. This item is nicely packaged, and comes with all its parts.

Why We Like This: