Just to elaborate a tiny bit - the CJM RRP essentially "splices" into the fuel system between the factory fuel pump and the fuel filter housing with regulator. Since it reuses the factory filter/regulator housing, pressure in the system will remain at original levels (except during right hand turns of course, where it will hold steady rather than drop).
By keeping the fuel pressure in the rails at the factory setting, the RRP system has no side effects to the ECU calibration. If fuel pressure was made higher or lower, this would effect the volume of fuel to pass through the injectors when open, requiring the calibration to be adjusted. But we were able to easily avoid that.
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