My K & N Air Filter Conversion
This is one of the more popular Modifications done on Jeep Cherokees.  I have done it, and when I did it I followed these directions. However Instead of using the hardened pipe that they suggested I used a piece of 3" 26 gauge duct.  Well it worked but I didn't really like the look of it or its intregity.  So I decided to change the design. And here it is...
METAL PIPES SOMETIMES HAVE SHARP EDGES, DON'T CUT YOUR FINGER.  ALWAYS USE A VICE WHEN DRILLING INTO THE PIPE.  ALWAYS WEAR GOOGLES WHEN DRILLING METAL.  AND THINK BEFORE YOU ACT.
Why do a K & N Filter Conversion?
Here is 2 good reasons:
1.  Increase in Miles per Gallon.
2.  Provides of 2% - 4% Horsepower.
                          For more information click here for the AJ USA FAQ.
Materials Needed
Hose Barbs
1 K&N Filter P/N # RE0810
1 K&N Air Breather P/N #62-1150
1 K&N Filter Service kit P/N #99-5000
1 piece of 3" copper pipe about 4" long
1 3/16's inch brass hose barb
1 5/16's inch brass hose barb
2 3" max hose clamps
drill
drill bits
threading taps
screw driver
Thread Tap
3" Copper Pipe
1) After you get your materials, size up your hose barb's threads, match a drill bit and a tap for each hose barb.  I had a 3/16's and a 5/16's so I matched the bits and threads accordingly.
2.) Drill your holes in the copper. I placed the larger hole at about 8'clock and the smaller hole at about 4 o'clock to match my hoses.
3.) Take your thread taps and thread the holes so that you can screw the hose barbs into the 3" piece of copper.
         It Should look like this now:
4.) Then I filed off all the little burrs or strands of copper left over from the drilling.
5.) Now that the conversion is ready I went to the Jeep and removed the old air filter box.  It was a pretty easy task, if you get stuck just look in your chilton/haynes book. ** now would be an excelent time to clean your throttle body by the way.
6.) After removing the air filter box, I cut the PCV valve hose back by about 6 inches or so, you can cut it to any length or even add hose and run your PCV filter where ever you want, but I chose to keep it close to the air filter. (as seen in photo below)
7.) After cutting back the hose I took a medium hose clamp and clamped my K&N PCV Air Breather on.
8.) Finally I hose clamped the 3" copper onto my rubber air intake hose, then hose clamped my K&N Air Filter on.
And this is what it looks like when its all done, isn't it spiffy!!
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