in your case, just removing the catalytics with stock exhaust may help, and stay legal. For the cross pipes, you should probably get a tried and tested catback exhaust, then decide if you want to get rid of the front cats for louder/more powerful results.
I would say to get rid of part of the exhaust that has the most restriction or by following the Tuner threads to see which replacement part has the greatest gains and allowable for your budget and preference. And then deterimine whether or not your life/driving style will appreciate the "sound" as some will find it "awesome" and others "bothersome".
Im getting the FI Catback and Hi-Flow due to it power increase and will expect it to be louder,.
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