Just got done swapping out my MRT catted H pipe, for an O/R X pipe, but the only problem is now that I can't get off the O2 sensors from my H pipe!!! It's like the force of God can't even screw them off, any tips?

 

Buy new ones?

 

Lots of WD and let it soak, you might even have to use a hammer to break it loose.

 

PB Blaster would prolly do a little better than WD40, let it soak for a couple minutes. A vice and a breaker bar would be my last guess.

 

At work we use a product called corosionX to free up wheels when they are stuck on the hub. If you can find that I would recomend that. It works really good if you let it sit for like 2 minutes.