does anyone else still make these, other then WeaponR? im just looking for other brands out of curiosity. and i know i can do the much cheaper antifouler method, but i would prefer to buy a part.

Greddy makes an O2 adapter for their eManage, plugs into the ECU wiring. The stock O2 remains hooked up though.

The schematics for O2 simulators are readily available on the internet - they're not much more than a 555 timer circuit that replicates the square sine wave that a normal function rear O2 sensor sends out.