I have a Scorpion non resonated, and love it, though apparently it is loud when cold, or when giving a bootful. Never had any issues with drone or anything like that. However, i know someone who had a resonated Cobra, and it sounded very good, not much quiter than mine under load, but probably quiter when on the move. Depends what style of tips you want too, personally l like the look of mine, as i think it looks more aggresive, and follows the line of the back bumper.