- 2018 Single-source
new for 2018; LT, requires PI5 and the 3.6L LFX; leather seating (H1Y, H0V, HV9) and AG2 (GM Authority's 2018 Impala article, narrative package-contents section, which is not the credited 'Official RPO Changes' list)
SPX Single-source
Documented applications
This page aggregates every documented appearance of SPX in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.