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I had a P3 gauge installed. The highest boost ive ever get from my 125i is just over 1bar (think it was something like 1.02bar). Some website have claimed 328i run 1.25bar boost. I wonder other than the size of exhaust pipe (70mm vs 75mm), does both car have different fuel map as well?
If this is the case, can we just replace a 328i ecu on 125i?
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