To reinforce the recommendation that you reinstall the catalytic convertor, I think it's illegal in the United States to remove a car's cat if one has been installed. If you live in a state where there are no annual state inspections, then your chance of getting caught is virtually zero, but I'd still recommend putting it back on.
Those who have installed the 2 1/2'' exhaust with a cat have still noted a performance increase, and it's not like the cat is just some part in the exhaust system that serves no other purpose than to restrict airflow. It's there for a reason.
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'89 244 GL -- 106,XXX miles (see profile for info on car)
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