Hi, I've had this rattle on my s3 for a while now when accelerating slowly including after changing gears, rattle lasts about a second. Now at first I thought heat shield but as far as I could see nothing was touching. I had my car serviced at my local vw garage and asked them to check it out and there response was the cat was knackered. A few days later I took it to my local ats and asked them to have a look they also blammed the cat. So as I've got a milltek cat back I've gone for a stainless decat. I fitted it this morning and guess what, rattle still there! Does anyone have any suggestions? My cam chain tensioner is making the start up rattle could this be linked or could my standard downpipe be my issue? I really don't know where to look now. Please help