Hi guys. Thought I'd introduce myself. Got a slight problem and wondering what people think. I've got a mk2 cupra r, it's been mapped. Has a oversize induction kit, r8 coils, pcv delete and amd diverter valve. When I throttle the car under heavy load (foot to the floor in 3rd, 4th, 5th and 6th) around 3500 rpm I get what sounds like chatter from the dv. Only lasts until 4000 rpm where the car literally takes off!! To me it seems like it's overboosting, diverting it then coping with it. That's just me making assumption though. A mate thinks a boost leak, and another thought faulty dv. Swapped the dv back to the stock one and the problem still remains. Just wondering if anyone has had anything like this before? Cheers guys.