Urgent help needed regarding gutting downpipes

[p3u]

Hey everyone,

As many of you know my transmission is being rebuilt and while its out my downpipes are being gutted. I just need to get an answer on the situation with the o2 sensors.

If I gut the pre cat, which has an o2 sensor in front of it, and leave the main cat, which has a o2 sensor between it and the pre cat, will I have to relocate the o2 sensors, and if so, where?

The car is being put back together tomorrow so I would appreciate any information on this, as I don't want to do it wrong, and have an expensive fix after.

Thanks everyone!

[melsas]

See Milltek downpipes which don't have pre-cats. I believe one o2 is in different place vs stock.
Also, I'm told Stage 2 REVO flash will bypass 1st o2. $50 plus cost of Stage 1.

[V8weight]

The secondary o2 sensors have to be relocated from in front of the main cat to behind the main cat. The primary o2 sensors stay where they are.