I am very cautious of multistage turbo charging vs parallel. To many points of failure with designs of this nature. The B58 powered m40i is plenty quick for its displacement and is much simpler. The only reason outside of fuel costs for a diesel in this vehicle would be for towing large campers or other X3s :-)
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Current Garage
2018 M3 ZCP - Sakhir Orange
2019 x3 M40 - Glacier Silver
2002 745i - Kalahari Beige
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