thought i was the only one with this ! ... its annoying. is yours standard or remap/esseesse ? , ive remapped (sanspeed stage 1, 170bhp) , but definitely feels "fluffy" at 3-4k rpm , almost like a flat spot , been told its the turbo "backing off" . getting service soon , so will get all pipes etc checked out for leaks , cant remember this happening prior to remap, but maybe coincidental. will report back once checked out.