i wanna get ceramic coated headers for my 00 gmc sierra 5.3l. there is two types offered by edelbrock one has a.i.r. and the other doesn't. how can i tell what i have so i can order the correct ones. i know for a fact that my truck was made in Canada and it has EVAP emissions.

non air
http://www.jegs.com/i/Edelbrock/350/65002/10002/-1

air
http://www.jegs.com/i/Edelbrock/350/65012/10002/-1