To tap or not to tap?

[NTIman]

Retap and go on with your life. Either way, the proper way to fix it is to retap it or replace the manifold, go ahead and do it, and if you want to go aftermarket one day or soemthing, fine, if not, its fixed.

Also, I wouldn't run without a precat O2 sensor. They're on there for a reason. It can be common for an O2 sensor for strip the threads, I guess due to heat and rust (mostly rust)