I went, I looked, I had a see and a listen: bloody impressive noise on a bike. (Not as much as the guy who used to ride a Yamaha Midnight Special with a dive bottle strapped to the pillion driving a 750mm long truck horn, but still a good noise.)The mech-husband has taken a wire direct from the battery of the Suzuki (which he recommends, for reasons too obscure for me to fathom), through an inline fuse, to a solenoid before the compressor motor. The motor is earthed to the chassis. The wire from the switch to the existing horn is rerouted to the solenoid, which is earthed to the chassis. You push the button, loud noise ensues.Paul (the mech-husband) makes it sound easy, but he is a bloke with good handskills. For myself, I would give the job to my local auto sparky, if I felt it necessary to turn up my bike's volume. Personally I have only ever used the horn to toot goodbye to folk. When feeling threatened by other road users I am always concentrating so hard on defensive riding to keep myself out of their way that I don't have available brain capacity to hit the horn switch as well: statement of fact, not attempted humour. I'm always lost in admiration of drivers that are so skilled they can spare a thought for the horn along with all the other data processing and control inputs they need to make to avoid the ouch. In my world a horn is only a legal requirement for a WOF. My history shows, I guess, that I am less defensive than I oughta be on my push bike, 'cos that's what I'm on every time a cage driver tags me. Maybe I should put a dive bottle and truck horn on that: if the noise didn't help, the weight would slow me down to a speed where my skinny little brakes and skinny little tyres might stop me before pain commenced.