The MAF conversion comes with a tuned chip that not only increases performance, but takes care of the new air metering device and how the ECU interprets it.
If you have a stock engine, or very near stock, you won't need a custom tune, the base tune provided will be just about perfect. On a bone stock engine you could see MAYBE 5 more HP if you engine is really tight and fresh.
The WAR Chip is for flexibility and if you have any plans of changing your engine to make more power in the future. Also with the WAR Chip, if you buy another BMW or do an engine swap with another OBDI BMW engine, you can use that same WAR Chip with your new ECU, simply load the proper tune on it and go.
If you have a stock engine, or very near stock, you won't need a custom tune, the base tune provided will be just about perfect. On a bone stock engine you could see MAYBE 5 more HP if you engine is really tight and fresh.
The WAR Chip is for flexibility and if you have any plans of changing your engine to make more power in the future. Also with the WAR Chip, if you buy another BMW or do an engine swap with another OBDI BMW engine, you can use that same WAR Chip with your new ECU, simply load the proper tune on it and go.
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