Well...let me re phrase another question..." Has anyone installed long tubes on their mag and the CEL came on.?" And If so how did you fix it? Long tube dynatech headers and the O2s are relocated now and have P1128 P1129 Codes...Called Dynatech and they told me that the O2 s need the frequency s band opened more....anyone ever heard of this? It's an 06 5.7....Any thoughts or ideas on this are greatly appreciated. Thanks

 

Most people get the rear O2's written out in a custom tune.

 

Wonder if the front sensors are simply too far away, and not heating up enough. Might have to wrap the headers......