If you are coasting and then apply light throttle, do you hear the same clacking noise? If so....it could be one of many things.
1. The U-Joint on the drive shaft can develop some "play" especially under a year or two of "enthusiastic" driving. You may want them to check to make sure the U-joint is tight and snug...there should be NO play.
2. Engine Mount....sometimes they become loose. Get them looked at.
3. Most probable.....Transmission mount...get it looked at and tightened down to specs.
If it isnt one of these you are looking at something a bit more costly...good thing you are under warranty (rocker arms, cams, detonation,etc...). Probably not the case....I'd have them look at 1,2, and 3 first.
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