Top up, wind noise starts at 35 mph and gets louder from there. At 60 mph, it sounds like a rainstorm is pounding the roof. Top down, there's so much wind buffeting, even with the windows up, that any other interior noises are drowned out, including the muddy-sounding stereo. Get earplugs, or noise-canceling earphones. But then you wouldn't hear the turbocharger whooshing on and off at lower speeds like a Peterbilt, which is kinda cool.