NOx levels will probably rise due to increased timing levels with an aftermarket tune, but more than likely co2 levels and HC levels will drop.
Only way they could tell is with strapping expensive sampling equipment on the truck and running it on the dyno. If the truck keeps stock exhaust and doesn't have gauges the techs doing the inspection would never think twice about it.
Only way they could tell is with strapping expensive sampling equipment on the truck and running it on the dyno. If the truck keeps stock exhaust and doesn't have gauges the techs doing the inspection would never think twice about it.