- 2005–2007 Factory-verified
The 2006 and 2007 lists print "ZR1 9-90Y" with a space; the 2005 list prints ZR19-90Y.
YFX Factory-verified
Documented applications
This page aggregates every documented appearance of YFX in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.