I read quite a few posts about the
pre cat delete (with 2in pipe)and the one thing I havent seen mentioned is what to do about the O2 sensor . I'm assuming a bung needs to be installed ?
Also plan on gasket matching the factory header

 

You sure you want to remove the pre-cat O2 sensor?

The pre-cat sensor is what the engine controller uses to fuel the engine properly.

 

No ,you miss understood . I want to replace the pre cat section with a 2 1/2 pipe . I wasnt sure if I needed to keep the O2 sensor . I guess that pretty much answered my question though so thank you