Tune adjustment for longtubes

[capss9c1]

Its a 2002 Camaro ls1 A4 and im looking to adjust the tune for the longtubes. O2 sensors are not switching correctly at idle. Looks like the o2 sensors moving farther away from the cylinders caused this. Any help appreciated. Thank you.

[Oleblu]

How old are the o2 sensors? and how much farther back are they from stock, did you have to use extenders? Or find some with a longer harness. in the gen 4 section there is an awesome thread about o2 sensors and longtubes very helpful. alot of the same parameters apply to the gen 3 stuff but some we do not have still a great read though i learned well from it. luckily for me when i installed longtubes on my pcm swapped 97 truck i was able to re-route my harness and use the same o2's i was with factory exhaust. didn't have to adjust anything after i got my exhaust built correctly without leaks. This all in a full 3" system from header collector to muffler out.