Vortech comes with warranty. . . Shame it only counts in the US. As for noise at idle, it's not that nice to begin with and very unusual sounding for a car, but it grew on me. Personally listen to Ekona, he generally speaks the sensible truth, but if your brain hurts when you read his comments, you probably have a problem and should buy a supercharger, or turbo if you are smart and having someone else do the work.