I took it into VW and they advise they advised me it was something to do with the exhaust bending when the throttle is opened and that's making that rattle....
They said because these are new and a little different to the MK5, they couldn't fix it considering it was hurting the car...
They said it's under warranty if it breaks.....I told him thats the last thing I want back and fourth..fixing issues...
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Will wait and see if anyone else has the issue....or can provide a fix...
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It seems to sound lower and lower after a good beating....maybe heat related
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Anyway it's still a joy to drive..and gets better everyday