Fred, the light chatter is somewhat normal, for such a big clutch, and one that is not of great design. The reason you don't allways feel it, is that it must engage at that same spot. I'm on my 8th Viper and yes, 1 out of 3 seem to have a light chatter upon takeoff. As for the exhaust system, well yes, mine does that, it is a result of the light chatter, shaking the exhaust system. The exhaust system is sensitive to this since it is mounted on rubber mounts. The R&R to do this is around $250.00 to $350.00 depends where you go. It would be nice to have a Dodge dealer do it, that way if they do something wrong, they will fix it. And you say your clutch does not slip, It does under a hard load, when you put the Center Force in, you will know it's been slipping, as you shift into second, and the car lunges forward nicely in a way you have not felt. NO chatter, smoother engagement, very hard to wear out, nice upgrade.
Skip White