Originally Posted by tizzle_ss
Can you elaborate? What do you mean by drone switching? Im aware that the auto uses AFM when on the highway / cruise, but is the quad port exhaust not installed solely due to the sound it makes when in 4 cylinder mode (AFM) or for other reasons?
Yes the do not put it on do to the AFM sound. The Mufflers on a L99 and LS3 even though they look the same they are not. L99 has stuff to help with drone along with the big butt resonator in the middle of the car. NPP would sound horrible when AFM kicked in.
Trust me I would know, I had a L99 and dealt with the drone issues.