i have a temporariy downpipe thats just a bend tacked to the flange pointed down, enough to get around to a exhaust shop to have it connected to the rest, theres no o2 bung and id be driving on a decent basemap, how bad is this to do? ui driven on basemaps before but never without any o2 sensor

 

well I dont see this being to big of a problem but your ecu will go into over rich mode unless you turn it off in your ecu settings.

 

just disable the O2...who runs one of those anyways

 

You get better gas mileage with the right tune anyway.

 

no kidding I disable everything

 

I have never owned a good O2 sensor in a few years