This happens only when im in 3rd or 4th gear, and im at wot and max boost. When I hit 3000 rpm the engine revs very quickly (as if its in neutral) to about 4000rpm than back down to about 3200rpm and i continue acclerating. Also at the same time the boost goes down a bit while the engine revs, than picks up.
There are no mods on the car. Im not sure if its anything to worry about, but it never happened before, and I just wanna understand why its happening.
Thanks in advance for any help