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Sgreg · 03-27-2009

Can someone tell me what is the primary difference in the memcal/prom used in the 1990 and 1991 ZR-1 with factory ECM 1228331 ? I have always heard one should not use a 90 in a 91 even though the ECM is the same. Please tell.

03-27-2009	#1
Sgreg Join Date: Aug 2006 Location: Texas Posts: 518	Chip burners jump in !! Can someone tell me what is the primary difference in the memcal/prom used in the 1990 and 1991 ZR-1 with factory ECM 1228331 ? I have always heard one should not use a 90 in a 91 even though the ECM is the same. Please tell.