I've used the Dynomax Super Turbos on two of my Road Runners, one a 383 & one a Hemi; both had tailpipes & OEM chrome tips, both sounded great & crisp, neither had a drone. Not excessively loud, though certainly audible. The 383 ran stock exhaust, the Hemi was headers & 2.5" all the way out with the tips cut back at the entry to 2.5" ID.