On the Brisbane Polo dyno day, we established that an FMIC will give approx 5kw atw, downpipe (or assumably full exhaust) would give about 7kw atw and both combined would give 12kw atw.
The FMIC also gives the benefit of less heat soak meaning it can keep the power for longer.
So basically, the exhaust will give you a bit more power but the FMIC will hold the power longer (as well as the power boost).
They don't really need to be done together, but obviously it would be better.
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