can you guys tell me what advantages it is to remove the cat

 

with a stock truck you become illegal, get Slightly better exhaust flow... better sound if you have an exhaust. and you get that real exhaust smell like when cars had real engines in them.

But like any mod it will add up with compatible mods

 

can anyone give me advise on removing the o2 sensor i heated it up with a torch and used a o2 sensor socket but it will not budge any other suggestions

 

No advantage to removing the stock high flow cats.

Heat the bung, not the sensor. Sounds like no anti-seize was used.