Mine was on when i got her 11 months ago. Liked it at first but starting to get get a bit annoying now. Older people who don't know what they are turn round in the street and look at you when you come up behind them. They look at you like you are driving like maniac cos they can hear the noise, when in actual fact you are just driving like everyone else but just can't help the thing goin off ! Heard stories bout cars runnin crap when you take em off so leaving it on. Like it sometimes though when the right audience is lookin at the car ! ! !