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I have a 2010 318i Sport Business Edition, I have seen a nice 57 plate 520d M Sport and was wondering if anyone can let me know if it is even worth upgrading to the 520d as they both have 2 litre engines, I know the 520d is pushing about 40 more BHP but a lot heavier car so just wanted some feedback from people that will know more about the cars than I
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