[QUOTE=acsWRX]Can anyone provide detailed instructions on how to perform the resistor mod for O2 sensors from a stock gutted uppipe?
Thanks, Andy[/QUOTE]

Remove up-pipe sensor, block off the opening on the up-pipe with a properly sized bolt, unplug sensor from the harness (and put away somewhere safe, for later use), put 2.2 ohm resistor in the harness on the car, and you are done.

Really easy mod.