I put an MRT catted H Pipe in this weekend. Took about 2 hours. The impact wrench was very helpful on the exhaust manifold bolts. Everything went very smoothly. The front 2 O2 sensors came right out, the back two I ended up using vice grips.
The car is a LOT quieter inside the car now than with the MAC catted X Pipe. I'm really suprised in the volume difference, I'm thinking it's in the quality of the cats, I cannot imagine the crossover style made that much difference. It's still about the same volume behind the car. I'm using Ford Racing catbacks. Overall I'm pleased.
Thanks for the help guys.