I was looking at replacing the stock exhaust manifolds on my truck and I see them listed as w/A.I.R and w/o A.I.R.. What does that mean? Is it the smog pump?

My truck
1990 GMC Sierra
Short Bed Std Cab
5.7 Auto 4X4

I was looking at replacing the stock exhaust manifolds on my truck and I see them listed as w/A.I.R and w/o A.I.R.. What does that mean? Is it the smog pump?

My truck
1990 GMC Sierra
Short Bed Std Cab
5.7 Auto 4X4

Yes it is the same thing as smog pump. My 90 did not come with A.I.R.

//2000CAYukon

Yes it is the same thing as smog pump. My 90 did not come with A.I.R.

//2000CAYukon


I took my smog pump off. Should I order the headers with the AIR option?

I took my smog pump off. Should I order the headers with the AIR option?

It all depends on the smog requirements in your area. If you don't have smog testing then it probably is not an issue.

When I was a kid, I took off all the smog equipment on my car. Of course, california started smog testing a few years later and I had to put it all back on.

//2000CAYukon

thanks for the info.