Exhaust, active, quad-outlet, sport mode enabled

Years 2024–27 Models 2 Factory citations 6

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Also described as Active exhaust, dual, sport-mode enabled

Also documented for Chevrolet

Documented applications

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation, AT4: not offered; AT4X, Denali: O; Denali Ultimate: included in the trim group, upgradeable

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.23.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026)

2024–2026 Factory-verified

the upfitter lists read "Exhaust system, performance"

GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.14.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.12.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of NPP in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.