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The HKS GCC III is a **add-on product** for the VPC or FCON systems. Users of these systems will quickly realize the limited tuning availability of the base units; they simply don't offer the opportunity to fine tune your air/fuel curve. The GCC will provide this tuning ability to you. With a simple plug in installation, you can now realize a nice HP gain as you tune the entire RPM range.
From HKS:
The GCC is an electronic tuning component designed to add additional flexibility to the fuel tuning capabilities of the VPC, PFC F-CON or F-CON S. The GCC simply plugs into either the VPC or F-CON harness and allows the user to further adjust the air / fuel ratio at five specific rpm points. Each five points offer an adjustment range of 16% rich to 12% lean, in 2% increments, of the base value. Four different selectable rpm ranges allow maximum rpm level flexibility when tuning the fuel curve. The GCC will interpolate, or average between the rpm points of adjustment to ensure a smooth transition of fuel delivery throughout the RPM band
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