i recently put some longtubes on my car with no provisions for EGR or AIR so i got rid of them. i know ill pull codes, and have read them and just wanting to know about them.

before headers i was pulling-
p0300-random misfire (i think it was from the heat shield on the manifold, broke off)
p0443
p0449
----both evap codes

then after-
p0300- gone!
p0405-egr
p0410-air


i understand all of them, and why theyre showing, except for the 2 evap codes (p0443 and p0449) why am i showing these codes? before and after headers? is this the evap system with the fuel tank? or is this crap associated with the egr?