Considering a new DBX (>$300k) is over twice the cost of a new x7m60i, they really should not be close.
But you could get a used DBX707 or get a used X7 m50i, some pure turbos for $5k, a custom ecu tune for $500-1000, and have much more horsepower than the DBX with a lot of $$$ left over that you saved not buying the DBX! With a 4.4l v8, the n63 in the m50i should have greater potential than the DBX's 4.0l v8 if you're going to tune.
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