Subject: Adding NPP Performance Exhaust

Models: 2014 - 2015 Chevrolet Corvette Stingray

This PI was superseded to update Model Years. Please discard PIC5985.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern

A dealer or customer may enquire if RPO NPP (Performance Exhaust System) can be added to a Stingray that was
produced without the option.

Recommendation/Instructions

Do NOTattempt to add RPO NPP (Performance Exhaust System) to a car that was not manufactured with it.
General Motors does not support the software changes that are required

Please follow this diagnostic or repair process thoroughly and complete each step.
If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performe