ECU Remapping, done professionally, will always be the best way of tuning an engine. Much more parameters can be adjusted than with any chip and will lead to more gains, more efficient, safer, and ultimately the only complete way of tuning.
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ECU Remap vs Chip
ECU Remapping or also known as Software Upgrades, done correctly, will always be the better and safer way of optimising an engine. Much more parameters can be optimised than...