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Put the ignition on but dont start, turn the light stalk to sidelights then off then sidelights and off again, it should beep, that will be automatic lights off/on.
I havent done that in a while so I could be wrong lol.
Aston Martin use them as do Lamborghini.
When my mate with his Monaro VXR was enquiring at Vauxhall on the different system, they actually offer this type of system, although I remember the price being around £1500 lol.
The system that most car manufacturors opt for, relys on a valve opening at a set RPM its normally done electrically, but the gas then bypasses the silencer straight out hence lots of noise.