Quote:
Originally Posted by The Boss
G80 was just the Posi Rear RPO, G92 was the performance gears RPO code and not all of the 89's got the N10 exhaust as it was phased in that year.
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my brain fade, G92 is correct, any 89-90 IROC with G92 / N10 is the one to have, all others are "cruisers"