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blykins Are you using a heated O2 sensor? The best location is 6-9" after where the collector pipe meets the muffler. I hope you have an HP coating on the pipe to keep the heat in. A wide band )2 is also what you want for those WOT runs. I have mine on the inside of the side pipe 6" after the collector. The hotter the O2 is kept the better the readings are. WATCH your GAS. Unleaded ONLY stay away from additives for octane boost even though they say O2 sensor safe. The tube idea may work but if the tube is not in the middle of the flow for all the cylinders you are not going to get the correct readings. It could be off as much as 8-10%. I would have the EGT's checked on all cylinders before you go for the A/F readings. FE motors have 2 leaner cylinders than the rest. If you are looking for a in the neighborhood the tube would be OK, I guess. I hope this helps. Rick Lake
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