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I have been in discussion with Birds over the remap. It is expensive compared to a typical DMS cost...but then DMS can not offer an ECU remap yet.
The Birds product is not a plug in box (I beleive it is in the Diesel) it is a complete ECU remap which involves sending the ECU to Germany. The turn around time estimated for this is 5 days, so if you go down this route you loose the use of the car for these days. The positive side is they claim to have done a lot of testing on the remap and back it up with a warranty and claim not to have any issues/fauls with any of the conversions done over 20 years. The ECU can be reverted back at a small charge. From my dealings they seem very professional and positive. I am still deciding if it is worth the cost!
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E91 335i M Sport
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