Just completed the Evry mod on my 02 Jetta 5-spd. Used a small 1k ohm 15-turn potentiometer from Radio Shack. Super easy to do. Measured the resistance at the point where the engine began to shudder slightly... turns out on my car 470 is the sweet spot. Anything more and the idle is terrible. Moreso than I'd be comfortable driving with. At any rate... I'm IMPRESSED! I lined up against my buddies 03 Jetta Wagon (he just bought it). The other day we were dead even against each other from any speed. With the Evry mod I flat out walked away from him - in a cloud of black smoke! LOL!
Tomorrow night we're gonna wire up a switch or some other method of avoiding the CEL..... and he's gonna do the mod to his Jetta as well. Thanks to this forum for the wonderful info!!!