DiamDave, do you have the same part number which Dodge will use for the challenger ? A sound byte would be nice. I was considering SLP loudmouth but I might be happy with what it comes with. I want something that sounds as close as possible to my old big block at idle.
http://www.youtube.com/watch?v=7gwo8OoFH8o is the closest I have found a SRT sound like it.