With a "remap" you can see a small gain, maybe 10 or 15% or there abouts.
I remember the days of the K&N filter and JanSpeed exhaust. Both would show a similar small gain but at 6,000rpm and your X Flow might go pop if you went around making use of your new hi performance motor !
The remaps I've seen alter the torque and power figures to give a little extra low to mid range which is more useful. The after market systems are more flexible and offer more options but you might have to upgrade parts to make the best from them, but its still remapping .
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