(Mounted in 2003 BMW 330i)Because of the tight space under the hood, I had to mount the compressor in the trunk. The kit included enough tubing to reach from the trunk, along the passenger side (plenty of room running beside the cable run), through the firewall and into the engine compartment. Not a hard install at all, especially with the battery in the trunk.Compressor operated exactly as advertised, and pumps up quickly. Once installed, the horn sounds GREAT! Totally worth the price and couple of hours of your time to put it in.The only recommendation I have is to use Locktite on the fittings. Not the highest quality (small leak), but works fine with the Locktite. All things considered, I would purchase this again (and likely will for another vehicle).