EDIT: Sorry, I thought you were comparing to a 328i.
The X1 will drive extremely similarly to a 128i. It uses many of the same parts and has a similar power to weight ratio. The X1 35i uses many of the same parts as the 135i (engine, transmission, steering rack), but the 128i has the old non-turbo inline 6. I find the 128i's engine more enjoyable to hammer on, but the engine in the X1 28i is more powerful and has far more torque.
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