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Im currently in the process of makeing my own midpipe and found thus far that to just cut out the cat is a better idea than to try and hollow it out. A couple reasons are that if one tiny piece of that lovely platinum that it's made out of gets by your excellent vision and is able to be sucked in on decel it's curtains for your fun loving experience, an other is when you fab up the pipe it gives you more room for bends or design options to just have that extra 4 to 5 inches of tubing to play with. As for the O2 sensor, as long as you keep in the exhaust stream you will be ok, but to extract the most get a PCIII and tuned.
 
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