Problem solved. The new MAF sensor was the problem. Had the exhaust checked and it was fine, also the converter was fine. The new MAF sensor caused the PCM to think it was getting more air than it was causing huge amounts of fuel to be injected which caused the converter to overheat. After buying another new MAF sensor the problem was solved. Now enjoying a 5 mpg increase in fuel economy and it runs and shifts so much better. No catalytic converter overheat.