Musstardo

I've noticed a constant flutter noise coming from my F6 ute when it is off the throttle and it only appears when travelling 80+ kph but is gone as soon as the accelerator is pressed, I know it's not normal turbo flutter so was wondering if anyone else has had this? The ute only has minor mods - CAI, stainless exhaust, injectors and a tune

Just joined this site and considering coming on this cruise, got a BA F6 Tornado