The Sound Architect™ Exhaust for the i8 provides an artificial soundtrack with a full range of notes - deep and powerful at idle with note and volume rising with rpm.
The note, volume and 'start-up' are all easily adjustable by the driver and integrated into the car's original controls.
At the push of a button it goes from silent to 'Racecar' loud.... and back again. It is almost infinitely variable - instantly.
Installable in about 90 minutes and has no emission or warranty consequences.