definitely no muffling going on with the one I bought. And i know muffled when I hear it, as an owner of a hi-fi system that i wouldnt let a russ andrews cable near!
I appreciate a good cable, and indeed even my mains cables in my main system are uprated jobs. But in a car environment, i defy anyone to notice the difference between one perfectly adequate cable, and another. Especially given the signal starts by coming out of three tiny, very thin pins on the bottom of an ipod. Strapping thick copper cable to it, wont improve matters