A 4 banger is a 4 banger... it doesn't matter how refined it is... it will still be a little rough at times... DI has little or nothing to do with how smooth the engine will operate. The Mini had a smaller displacement 4 so I could see that making a tiny difference but probably not enough to notice.
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2jZ + RB26 + 4G63 + LS9 + N54 =
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