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7.3l ghetto exhaust options?

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we have a 99 7.3l and have it hopped up a bit. this is our lease/work truck and doesn't get on the road. well we have thought about chopping the exhaust off and running just 3.5" straight pipe. would i benefit from just dumping the muffler? or is the cat a big restriction too? right now the truck has a custom 6 pos. 140hp tune and intake but we run it on the 80hp tune as it feels like it makes the best power. is the cat on these trucks a big restriction?
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Cut it off get a 5" 36 in miter cut stack, 5" felxible exhaust tubing, expanders, strap clamps and a piece of iron you shape into a hanger and weld to your frame(we use a guillotine clamp on these to hold in position) I have put this same set up on a number of 7.3 its cheap easy and looks really good.
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