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You can get the filter from www.fleetfilter.com part #46637
They have the best price: $19.54.
If you are in a hurry you can go to the local NAPA and get a 6637. It will cost you twice as much from NAPA for the exact same filter.
Fleetfilter is a site sponsor here, plus they have the best prices that I have been able to find.
Here's the thread that I started with the filter.
It wasn't my idea in the first place, so I can't take the credit. I did take the picture and that's how was named after me.
i have this mod also. like in the picture, it just attaches to the intake piping. some users take a 4'' piece of 22* bend exhaust piping, and they delete the ribbed section of the intake pipe, it makes for a smoother airflow.