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If you dont want the risk of voiding the warranty BMW normally offer a performance pack. I have seen one on the SMW site for the 320d....uprated airfilter (i think), intercooler and re-map. It did not state the power gains but would expect something in the region of 30bhp and a fair slug of extra torque.
I've heard DMS are considered one of the best in the UK at BMW remapping if your looking for a third party
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