"Faking" an O2 sensor

[MysticZ]

I'm a bit annoyed now. On OBDII F-bodies there are 4 O2 sensors. Two
before the cats, two after to make sure they're working. When removing
the cats (which I don't plan on doing) you have to use simulators to
keep the ECM from throwing a code. These simulators sell for about $90.
What's bothering me is WHY they're $90?!? Is there something I'm
missing? Shouldn't you just have to give it a voltage on the lean side
of the pre-cat sensors? Can someone explain what I'm not understanding,
or am I right in thinking that $90 is a bit much for a glorified
resistor (like the skip shift eliminator for T56 transmissions, which IS
a resistor)?
-- 
Steve
97 Chevy Camaro Z28, Mystic teal, A4, not stock
90 Kawasaki EX500A4, black, M6, not even CLOSE to stock!
lt1_z28 at ev1.net  http://users.ev1.net/~lt1_z28
Aluminum, steel, carbon fiber, titanium, and two cast iron balls.
McMillan Motorsports- http://www.mmsbikes.com
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