If you run the O2 sim. can you remove the egr valve and plug the vacum port? Just wondering because of the possibility of getting the skunk2 im. I've been reading a few threads, and if I'm reading it right, that the skunk2 mani. does not have a place to put the egr valve and all you do is keep it connected and put it to the side some where. Will this cause any problems? I have a 5th gen and my #2 O2 sensor is bad and was wondering about getting a test pipe with the O2 sim. Cause I don't have to run the O2 sensor in the cat with the sim right or wrong?