[M.5.0]

The X5 M50 is my first turbo and have a (stupid?) question. Are you supposed to feel the turbos kick in? I kept it in 2nd gear from about 1000rmp to redline and did the same thing in 3rd gear. I just felt constant acceleration, but no boost.

I had it in the dealer the last few days because they had to replace the steering rack which involved dropping the suspension, getting a realignment, etc. I took it for a spin after. Believe me it's still fast, but I swear I could feel more of a boost when accelerating before I took it in. Maybe it's just my imagination. Is there any way to test if the turbos are acting normal??