im installing my pacesetters in the morning, along with y pipe. one question has to do with air and egr block off plates. from talking to my friend, the egr looks like its on front of the manifold and behind the throttle body. is this correct? if so mine runs to some type of cylinder thing from the bottom and then another line comes out.

 

ok, ive done some searching and have found alot of info. corrrect me if im wrong please. i have a 99 ss. i will have to have 1 block off plate for the egr on the top of the manifold and one plug for the air system?

 

alos, pics would be nice of where block off plates go on a 98-99 ls1, thanks....

 

If you have race style headers, you will just need one expansion plug for your intake manifold. You can just delete your EGR since your headers won't have an EGR provision. It will throw a code though. I'm not sure if 99's hade the AIR pump or not.

If you have emissions headers and your car has AIR, you will need 3 block off plates and the plug for your intake manifold. EGR/AIR block on the passenger side header and AIR on the drivers side header.

Check out this thread. https://ls1tech.com/forums/generation-iii-external-engine/480964-air-egr-removal.html