What kind of side effects will i see from doing this? Will it affect performance? I have a leak where the air tube meets the passenger side manifold on my 90 360 RC. Would it be possible to use a set of headers and just plug the air injection holes on the heads? IF so, has anyone done this before? Also what kind of headers is everyone running, likes and dislikes. It is an automatic truck and ive noticed in the listings of some of the headers it shows some modifications needed to work.