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Try Casper Electronics www.casperselectronics.com. They sell an inexpensive O2 simulator. If you need help wiring it in, let me know... (you'll have to retain your old O2 sensor for the heater circuit resistance to make the ECU happy).
For downpipes, I got mine from Dave Mashour, pmimporting.com
titan motorsports sells them for decently cheap www.titanmotorsports.com call them and ask about it
but why the need for o2 simulators?? im running no cat or resinators and just made a o2 bung about where the cat was and i threw a signal only once then just cleared it and never had a problem again or are you having air/fuel problems?