As part of my channel I buy and sell cars as a hobby and owning this X5 Diesel since last summer I didnt realize I had a boost problem as the suv is tunes etc and I dont drive aggressively -I had a #5 glow plug come up on a CEL code so I just figured that was the issue..But after my mechanic looked at my X5 he told me I had tear in the turbo intercooler pipe -so it was a night and day feeling after being fixed, no I can feel the difference in throttle responsive !