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I had my E91 320d mapped from 177 to 210bhp and it transformed the car in every area.
I also had my 123d done, same again.
Had a tuning box on the X1 18d and it took it from annoyingly lacking to pretty impressive.
I found more difference doing my 2 litre diesels than I did my DMS mapped 535d touring or JB 335i touring, both of those were noticeable, but the 2 litre diesels were a massive improvement.
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