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Originally developed for Spectre, we still carry this ECU. It's a Megasquirt-I based system designed for extra ruggedness and with plenty of extra upgrades. It has native USB support, nitrous control, boost control, and up to 4 ignition outputs.
These PDF documents cover its use:
eMS-Pro Installation Guide
eMS-Pro Tuning Guide
MegaTune Reference for eMS-Pro