On other business I was speaking with Mark Adams and I aksed him about this post. He and I looked at some tunes and such and here is the scoop from the guru.
NAS D90 (1994-1995) have a tune resistor. It is a 3900, but it is made into the harness about 2 feet from the ECU plug, gray/black wires. You can not see it unless you open up the harness (unlike older RRs where it is exposed).
Removing the cats has no concern for the tune or the ECU. His dyno tests show no issue with air flow, back pressure, etc. Yes, your exhaust will now stink, you can't do much about it.
So to remove your cats you need change nothing, nor will you gain anything if you do change ECU parts.
Even if you swap to a Euro spec tune and a 470 tune resistor the hydrocarbons out the tail pipe will still stink badly.
The benefit of a Euro tune and a 470 tune resistor is a little leaner running and better MPG as it removes the readiing from the 02 sensors.
Straight from Marks' mouth.
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