L&D Triumph in Dover Delaware obtained a dyno reading of 65 rwhp on a 2004 speedmaster with Specialty Spares long slash cut mufflers. 45 pilot jets 128 mains no needle shims and a stock airbox. You should be able to gain a few more hp by using a free flow air filter. As for loudness these mufflers have removable baffles that allow you to adjust the sound to suit your taste. Take the baffles out and they will rattle windows.
