When I start my Silver M6 in the morning I have a fast-paced tick that comes from the engine compartment. Stops after a minute or so. Tech at the dealership told me that< "The noise results from the different expansion rates of the diff metals used within the engine." Sounds like a carbon copy piston slap answer to me guys. Anyone else have this sound. It happenes on startup when the engine is cold.....It will go away if I hit te gas...even after 2 secs once started. then it comes back at idle.....anyone else.....sorry that this is so long and my first post was about a prob....I've been watching the boards since I got her in Sep 04.