im looking to get some headers but i dont know to much i keep seeing w/ or w/o air. and w/ or w/o egr what are these how do i knoe if mine is with or with out i have one tube on driver side and 2 on pass. side coming out of the stock one

 

its an 01 chevy right. 4.8-5.3-6.0??. if it is a .48 and above you have egr but not air.