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What software and hardware do you recommend to tune E46 M54 engine ?

Hi Kuna

that would depend i personally use aftermarket ecus like Link, motec, and so on.

so i guess it comes down to what you feel most comfortable using and can get the best support for and your level of tuning ability,

The only ECU I have found that will allow you keep all the car functions is by a Swedish ECU manufacturer - Maxx ECU.

I have an E39 so I will probably use this when the time comes.

https://www.maxxecu.com/webhelp/wirings-pluginecu-bmw_m54.html