Depends on the system. I have a BRC sequent 56 system and it is tuned(mapped) via a laptop connected to a dongle which accesses the ECU. When I had the car converted, I sat in the passenger seat while the fitter drove the car and told me what settings to adjust.
As CNG states though, what's the point of going for max performance? Go for efficiency and when you need max power, just switch back over to Super Unleaded
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