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And here's the response, so confirmation of what they've done. Although without giving a reason as to why they've done it, which is to presumably prolong the life of a possibly dodgy part
Dear Mr Davis
Thank you for your patience in this matter, I have now heard back from my technical experts.
They have informed me that here have been software alterations to the engine management system of the N54 in relation to the operation of the waste gates. It has been confirmed that these changes have no noticeable influence on power, torque or the response of the engine.
With this in mind, may I suggest contacting your local BMW Approved Dealership to test drive a 135i with the latest software. This test drive will be able to lay your mind at rest about the performance of the 135i that you have on order.
I trust this information is of use and can assure you of my personal attention should you have any further queries.
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