Bought my O2 extension’s from speed engineering. Read on another forum that the extensions could be the culprit. Has anyone else ran a reputable OS extension?

94 Z28 with long tube headers.

 

Can you source a few rolls of HIGH grade teflon insulated tinned copper wire, some 1/8 and 3/16 heat shrink tube, fresh production Rosin core solder and a decent solder IRON ?
................ I'll bet you can sort this.

 

All i can say is I’ve been running the same extenders since the late 90’s. I want to say they are off a Buick, but are a genuine GM part. I can’t give any more specifics than that, but it gives you are starting point if you want to search it out?