Well if Madamorr emission testing is like here in Calif. you need to have air pump installed to pass visual.
It does not have to work "if" you have the "disable" sticker issued by GM
GM part # 12569123
In looking at the TSB the service labor only has PCM re-flash for 96 (OBD2). For 95 I believe you can just pull the relay without throwing the CEL on...which "disables" the air pump
GM didn't want to pay the labor to "remove" the pump and cap off the exhaust manifolds, just pull a relay and flash a PCM for 96 cars. It is the specific language in the TSB, and sticker, that says "disable"...not "remove"
The TSB is for:
95-96 RM, Cad Fleetwood, Caprice & Impala with 4.3 or 5.7 engines
\'96 BBB 383/T-56