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Upgrading the GTX's ECU is a simple matter of removing the old and replacing it with the new. Road/Race provided us with an entire ECU, but it is possible to only upgrade the chip inside.
Project Mazda 323 GTX: Part 4

 Upgrading the GTX's ECU is a simple matter of removing the old and replacing it with the new. Road/Race provided us with an entire ECU, but it is possible to only upgrade the chip inside.  View Related Article

 

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