Interesting thread. It seems that Bigbob is the only one here who might have a setup worthwhile (assuming he didn't spend much money since it's largely homemade).
Bigbob ...you need to post some pics of your setup please. I might be willing to try yours if it could be fabbed up for a reasonable amount.
Not homemade, but also not on the market yet. There are many of these around. Being patents are pending on it I can't post pictures. I did modify mine quite a bit from the stock design. My modifications were to make the filters easier to service and had nothing to do with performance.
As far as easy to fab one of these up yourself goes, duck soup.
2006 Solar Yellow Rubicon Unlimited
Jeep Club Member #1340
6 Speed, Hardtop
Mods done: Hurst tee handle, cheap hand throttle, Rokmen Merc front bumper, Warn 9.5 TI winch with 3/8" X 100 worth of Viking yellow rope, DPG OME Ultimate with JKS ACOS up front, Kilby Gas Tank Skid, Kilby Steering Box Skid, Jeep Medic Belly Up, Skidrow Engine Skid, Rockcrusher Diff Skid in the rear, Warn Diff cover in front, , AR Outlaw II's and MTR 12:50/15's, Homemade rear Bumper, Cheap Cobra CB, Puma OBA, Sirius Radio, Locker Defeat, Rockhard cage, Rockmen short corners, homemade tire swing/tailgate hinge affair, Airlift air bags on the rear- - - - - - and more to come!