Here is a small audio sample of a 2017 Slim FLS with Screamin Eagle Stage 1 Air Kit, Cobra RPT Slip-ons tuned with an FP3 tuner. I could not be happier with the new exhaust note. The only way I can describe it is it's a low, deep bass, rumble while idling and cruising, and a loud growl when you twist the throttle. A lot better than stock mufflers, or the Screamin Eagle Street Canons that were on the bike before the new Cobras