i wouldnt recomend removing your cat. i removed mine and cut out the second sensor and my city gas milage went to shit and my car is running really rich! have a shop weld in an after market cat and a fiting for your second o2 sensor after the cat. im going to do this when i can afford to. have to get a header first though! 
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95 200sx timing advanced to 15*, custom cai, Stromung exaust (no cat), b&m short throw shifter, rusted out fenders, worn suspension, creaking balljoints, cracked windshield and bad cv axles. your regular hooptie that requires 92 octane.
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