Yes, the two pre-cats and the main cat. I don't know how strict your smog laws are but out here in Calif you can only replace your cats with stock cats or properly "certified" aftermarket cats. (Different states have different rules).

And while on that topic, here in Cali you also won't be able to pass smog unless your non-stock turbo kit has been "certified" by it's maker which of course doesn't work for us because there are no "makers" of turbo "kits" for these cars anymore. I'm gonna get around that by running my turbo car on an alternative fuel. Not trying to discourage you, just want you to be prepared for what may lie ahead.

Like you alluded to, "once it warms up", the car goes into closed loop, but before that happens, it is in open loop mode so there would be no harm in doing a full throttle power run with the cats off. If one or more of the cats are bad, your power will be back. And if I'm not mistaken, these cars are actually in an open loop mode anyway when they are under wide open throttle operation even when warm so it really shouldn't matter anyway. Still, I'm hoping somebody else here has a better test than mine for the cats. The mallet method doesn't work all the time because these things often just melt solid inside which means no rattling pieces, just a plugged cat. Go ahead and try it though, as it may catch the problem, just don't think that all is well if it doesn't rattle cause it/they may still be bad/plugged.
Regards, Eric

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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.