Actually it's LUVdiesel that has one, but i almost put one on my truck.
I just went to autozone and asked if they had any K&N filters for my truck, you won't find one under the Chevy LUV search but search for the Isuzu PUP K&N filter for the diesel, exact same motor and body just different emblems.(and FYI it'll cost you around $40 to get one)
If your talking about my ram-air idea for the diesel you'll need to just go to this post
http://forums.luvtruck.com/viewtopic.php?t=7276&highlight=all you'll need is the intake tube from a 1.8l luv and some wire (like just a plain wire, not electrical stuff w/ insulation)
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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras

00' Civic beater...