I'm installing Hedman 68608 headers on my 305. What in terms of the emissions system will become obsolete? O2 sensor? MAP sensor? EGR valve? etc... I have already taken out the AIR system and my charcoal filter as well as some other emissions stuff don't work, but I haven't sorted through it all. Just interested to know what I'm looking at in terms of things not hooking back up. Not interested in debates on emissions and how well the car runs with versus without...