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Although I don't have the f30, I do have an e90 with an N55, stage 2 power kit, performance exhaust, 6 speed with XDrive.
In theory the engine, exhaust and power is identical to the m235.
The obvious difference I noticed is weight, especially in cornering. It was massive. Turn in was dramatic. Front end grips hard. In fairness, I have older run flat potenza and the m235 had new PSS.
Acceleration seemed quite even though, maybe that was XDrive in action. One thing I noticed was power delivery from 4-5k. The m235 really comes on stronger. Mine seems more linear.
Things I didn't like:
Steering is too light, even in sport+. It's not about accuracy, but a tendency for me to swing the wheel expecting more resistance. And with the turn in of the car I felt it moved and grabbed quickly.
Plastic on the bottom of the doors, and under the glove box. Seemed very cheap.
Suspension seemed to bounce a little more than mine, even in sport or sport+.
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