I dont think pipes come much louder than Rineharts. Hope that answers your question. =) That being said, i think the sound QUALITY is better off the HKs. You guys would be AMAZED in what some companies do to tune the sound of their pipes. For example, Ferrari spends monts of time in studios (sound studios, that is, and I'm not kidding)and loooooots of $$$ to get the "Ferrari sound".