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Having done a bit more digging some tuners are now able to remap this car (emaps being one of them) but still not as straight forward as it used to be. Looks like the ecu has to be removed from the car and opened up to be wiped and reflashed, can't be done from the obd port, and when mapped if anyone plugs into the ecu it is flagged up immediately that the ecu has been modified.
So maybe a tuning box is the way to go, they seem to have developed a lot in the last few years and now control the boost as well as just the fuelling and are totally undetectable once removed.
Tdi tuning do as nice twin channel box which looks like it produces good results.
Any one have any experience of them or any tuning box or remap on their 535d?
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