I didnt know that existed. I have been using the NAV by asking OnStar. It has worked great so far.
SPi Performance Stage 2 package
PHADT FE4 ZL Stg.3
VMAX CNC Spiral Ported Throttle Body
Dynatech LT headers, Hi flow Cats
MBRP 3" 304 stainless X-pipe exhaust
Fastlane true CAI.