The supertones were not too dificult to install. I extended and used the original horn wire to power the supertones, then connected the supertone ground wire to the vehicle metal body. I am not sure if it will fit an 02-03 vent, but for me the fit was tight. I ended up mounting the supertones to the upper headlight bolt. The sound is pretty loud far better then the stock. The 300hz horn sounds really good, the 500hz, not so good. You can get by with just 1 horn connected, but two is always better.