QuickSilver worked tirelessly on the positioning, shape and diameter of the pipes to create a rich harmony. That's not just marketing speak, there really is a harmony sung by the different diameter pipes.
F1 cars are famous for their full bodied, discordant sound - and QuickSilver's NSX rises above the competition with an F1-style, augmented tone, present throughout the entire rev range. Just as a filmmaker would harness dissonant strings to excite the audience, our pipes combine to sing a minor second interval, resulting in a sinister howl.
The resonant pipes are tuned to phase out at cruising speeds in Sport mode, but become active in Sport +, resulting in a 3db increase / decrease at cruising speeds.