the gtb generation of vnt turbo's are leagues ahead of the old vnt's such as the 2256 etc.
a turbo from a bmw320d (55 onwards) is a good one, or the 530d (04 onwards), or even a hybrid of the 2, like alpina did on the single turbo D3, needed 2k to come on boost, but was still strong at 5k.
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