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How about GReddy E-Manage system? You can purchase optional injection, ignition, pressure sensor harness, and you would need the software in order to tune it. It can be used only up to 6 cylinders. Best luck.
Yes, the GReddy E-Manage system is available in U.S. The system along sells for around $380 retail and you can probably buy them around $310 on the street.
I am not convinced of the additional power/torque the E-manage can generate on a non-turbo GS. (probably less than 5 - 8% gain)
Most people in Japan that like to mod their cars opt for the turbo-versions, like the Aristo V300, where these products will provide enormous gains.
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