Throttle Body spacers seem to be mentioned on almost every BBS I visit. "Do they work?" "I love mine!" "Mine stinks!" It seems that any two posts are never in agreement. I set out to find the scoop on them, by installing the PowerAid TBS for the 4.0L in X-treme.

The kit comes complete with all that is needed to put it on, including new gaskets, bolts, spacers for the linkage bracket, and, of course, the "Power Plate". How does it work? Evergreen Performance (Manufacturer of the "PowerAid") explains that the rifled grooves (helix bore) on the inside of the power plate increases the efficiency of the inducted air.

We recently tested the PowerAid Throttle Body Spacer on our 4-cylinder TJ, a 6-cylinder TJ, and our 6-cylinder XJ with similar results. The installation show below is on Project '94 X-treme.

Since Poweraid does not offer a TJ 2.5L kit, a minor modification was necessary to use the 4.0L kit on our TJ. Click here for more information.

• Start by removing the intake tube, unplugging the sensors, and unbolting the throttle body and the linkage bracket (10mm bolts, 3 on the linkage, 4 on the throttle body). Set the whole assembly on its side and clean away the old gasket material.
• Next, place the spacers under the linkage bracket and bolt it loosely. Position the Power Plate with one gasket on top and the other underneath (top is indicated on the power plate, also).
• Bolt everything down with the included hardware. Reattach the sensors and the intake tube, and you're done. It's as simple as that. The whole operation took me under 30 minutes.

When tested on my neighborhood streets it seems to boost HP noticeably, and low end torque a little.

Whoever thought this one up knew a little something about cheap and easy power! The added power is noticeable through all ranges of the RPM band, on- and off-road. It's an excellent compliment to the 2.5L or 4.0L engine, and adds well to other power-enhancing add-ons.

(Please refer to the directions included with the kit for further details on installation)

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For more information, please visit www.AirAid.com

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Dirt Road Magazine is sponsored by Turner 4WD Parts Co.