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Usually people would modify the code that reads the map, so it keeps an overflowed value for normal use (most calcs are fine if they still think its 100kpa when its in boost), so you'd copy the 4 bar version in a new memory location, multiply that value in the original location by 4 and set it to max/100kpa if it overflows. Then you'd modify the fuel and spark tables to use the 4 bar value and the rest should be fine without seeing the boost. This way you dont have so many places to modify the code. Hope it helps.