Wonder if anyone could help me. Since fitting my Milltek downpipe it seems I get a rattle when I accelerate. And stops when I let off the accelerator. At first I thought it was something loose. Heatsheild or bolt ect but had it on ramp and can’t see anything. And it actually sounds like it’s coming from inside the exhaust. (Best way to describe it is lots of wee stones belting through it) Here’s the interesting part. I don’t have the cold start rattle anymore. It actually sounds the exact same noise but like I say, it’s not on cold start, it’s when I accelerate. I’ve got a few videos here, Any help would be greatly Appreciated. It still does it in sport unlike the cold start rattle noise would stop.