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I recently bought a BMW X3 2.0d. My last car was a BMW 435d. Convinced myself this was a family car and wouldn’t miss the big engine in what’s usually a traffic jam packed city. Also thought don’t use Harmon Kardon like I used to before. Happy with an X3, but miss the big engine and the sound system. Wish I’d bought the M40i with a tech pack. Best I could achieve with a tuning box is 250hp. Is it worth me trying to improve the performance of the 2.0d and install a Bavsound system or should I just upgrade to an M40i at the earliest opportunity?