Review: CALMINI Hi-Flow Filter Kit
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Authoring and Photography By: Chris Perosi
First Published: June 2000

Review: CALMINI Hi-Flow Filter Kit

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The new CALMINI Hi-Flow Filter Kit for late-model V-6 Isuzus.


When building up a 4x4, whether it be for off-road or street use, it's only natural to look for ways to beef up performance and horsepower. One of the first modifications most people make with the hopes of increasing horsepower is the addition of a specialty air filter, such as a high-flow drop-in replacement unit or a cone filter. One such product made especially for late-model Isuzus with V-6 engines is the new CALMINI Hi-Flow Filter Kit. The CALMINI Hi-Flow Filter Kit includes a large, oil-bath cone filter, as well as a custom bracket to keep the filter in place.

We received our CALMINI Hi-Flow Filter Kit in a white CALMINI box that leaves no doubt as to its origin. With the filter kit in hand, we set out to install it on Project Zeus, our 1998 Isuzu Amigo. The kit came with everything needed to install the filter, so we set out our tools and went to work.

The CALMINI Hi-Flow Filter Kit comes with a clear set of instructions noting the removal of the stock airbox and the subsequent replacement with the filter kit. The short list of tools needed are as follows:


After opening up the top of the airbox, we removed the stock filter. Once the filter was out of the way, the hose clamp was removed and the top of the airbox was placed aside. At this point we also carefully disconnected the wiring and removed the Mass Air-Flow Sensor (MAF). Although this step is not required, it made it easier to make all the connections with the new setup on our tall truck.

Once the top of the airbox and the MAF sensor were out of the way, the lower portion of the airbox could be removed. There were three 14mm bolts holding the lower portion of the box on, one of which needs to be re-used with the CALMINI setup. Using a ratchet with a long extension on the three bolts, the lower portion of the airbox was removed and placed aside.

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Top removed from the airbox and unclamped from the MAF Sensor.
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Careful removal of the wiring harness prior to removing the MAF Sensor.
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Removal of the three bolts securing the lower portion of the stock airbox.
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With the entire stock setup out of the way, we began the installation of the new CALMINI Hi-Flow Filter Kit. First, three of the four Torx-head screws on the MAF Sensor were removed, and the CALMINI bracket was bolted in place. It only fit one way, so this eliminated any guesswork that might be involved. Once the bracket was bolted to the MAF Sensor, we oiled our filter using a K&N Filter Recharge Kit, and attached it to the MAF Sensor with the supplied hose-clamp. We made the clamp as tight as possible without deforming the rubber end of the cone filter, and several vigorous tugs on the filter ensured a good fit.

Once both the filter and the bracket were bolted to the MAF Sensor, it was a simple matter to re-install the MAF Sensor on the intake tube using the hose-clamp that was removed earlier. Then, one of the bolts that held the stock airbox was re-installed to hold the bottom of the filter bracket, and the wiring was re-attached.

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Stock airbox assembly completely removed.
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CALMINI Hi-Flow Filter securely clamped to the MAF Sensor.
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Spraying new cone filter with a fresh coat of K&N Filter Oil. (Recommended by CALMINI)
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Unbolting the Torx-head bolts from the MAF Sensor, prior to installing the bracket.
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In total, this modification took about 15 minutes to complete, start to finish, including gathering up the tools.


We haven't been running the CALMINI Hi-Flow Filter Kit long enough to give informed opinions on things like gas mileage and overall horsepower increase. However, initial impressions look quite promising. Distinct gains in acceleration can be sensed, particularly above 3000 RPMs or when traveling uphill. The truck seems to have no problem reaching down and grabbing some power when you really ask for it.

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Coming next month, we'll report back on our long-term test results. We'll be adding side-by-side 0-60 and 1/4-mile comparisons with the stock filter, as well as percentage of change figures for gas mileage and overall horsepower. If you would like to discuss this and other modifications with us, please visit our Trail Talk Forums.

    CALMINI Hi-Flow Filter Kit
    CALMINI announces Hi-Flow Filter Kit for the 1998 - 2000 Rodeo, Amigo, Passport, Trooper and VehiCROSS!

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