Re: 90 vs. 91 FSM?
yes, mainly the electrical.. there are quite a few changes from 90 to 91, especially the forward engine harness for sure, plus changes to the dash wiring to allow for the Delayed Accessory Bus (keeps radio and windows powered for an extra 10 min or until a door opens)
that said, for most things, no it is not needed, but for other stuff I would recommend it.
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Shelby Series 1 - Wilwood Brakes
Custom Interior
NCM Lifetime Member #978
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