I wouldn't think 1" on a Straight Tube would make much difference. 1" in a bend would though.
I thought some more about the material swap and temperature change, and although I still don't think it would make much difference, the swap to aluminum will make the air inside the tube higher, not lower. Thermal conductivity of AL is 9.5 times that of SS. Even if you assume the Aluminum tube has twice the wall thickness of the SS, the AL will transfer 4x heat from hot surface (engine side) to cold (air flow side).
This is strange. My wideband sensor is on the driver side, where it was showing too lean reading compared to passenger side, that was showing normal based on o2 sensors readings. Swapped the o2 sensors but the results were the same. This is where I started to think about the injectors on driver side being clogged and decided to replace them with new ones.
So you are replacing a narrow band sensor with the wideband? Are you setting everything to force open loop?
I doubt you have clogged injectors in one side. More likely intake or exhaust leak on that side. Or a wiring issue.
I’m sort of just guessing but intake leak is more likely to cause lean on one bank but fine on the other than clogged injectors. Remember you still haven’t posted tune, log or details on your build. But what would make injectors clog on one side but not the other?
I will post my tune and log.
Is logging at idle for 5 min sufficient or it should be logged while taking the car for a short drive.
The engine is 2003-2004 LS6 on a 68 camaro with cam, long tube headers and FAST 92mm intake manifold. Not sure about the full cam specs as it was installed by the previous owner. I know it is 228 but no idea about other specs.
If no one else responds, I'll try and see what I can do reviewing it this weekend (can't do it on work computer during the day, and the last thing I want to do is sit at a computer in the evening). I'm still very new to this myself so I may or may not be able to spot anything.
Had a few minutes to check tonight. Your narrow bands indicate that both are lean, Voltage is 0.12 on one bank and 0.07 on the other. That would indicate lean on both banks. You might want to get it into closed loop and see what happens.
Don't chase a specific number especially for light load/idle areas, the 'correct' number is whatever it needs to run best.
My comment was more that both banks looked very similar vs one side be correct and the other lean enough to indicate a serious injector problem.