At the moment I'm running the following Mods: FMIC Front air filter relocation HKS SSQV HKS Actuator set @ 1 Bar JAM ECU Decat and SPS Mani Straight Through Exhaust system Im worried about running it lean with no fueling mods, especially with the ECU? I think im going to invest in a A/F ratio gauge, but is it worth getting a RRFPR and Fuel pump? even with the ECU? Any advice would be appriciated thanks