It was because of the new interior-it was so quiet-Lincoln quiet-that they thought up the sound tube thing. I love my R/T but I am a Mustang fan also. In fact we just picked up a sweet 06 GT convertible for the wife! I'm a fan of both cars so dont be too hard on the Stangs, If it weren't for Ford and the retro Mustang in 05 I'm not sure we'd be enjoying our New Challengers!