I have a 2012 f250. I deleted egr and exhaust a couple of years ago. Truck has ran great since. Last month at about 120k miles the turbo went out. I had it replaced with OEM replacement. Now, at right around 1100 rpm, under slight acceleration, I get the turbo flutter coming from airbox. It's an ARS, if that makes a difference. Mechanic blames tunes on tuner, tuner people really have no answer, but say it doesn't sound like it's their tunes. Never had this problem before changing turbo. Doesn't really affect the performance of the truck, but is annoying. HELP.