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Alright guys, this might be a long thread. I had a 99 civic si, aem fuel rail, rc 440 injectors, turbonetics turbo, intercooler 2.5" pipe, greddy bov, no dump tube, no cat, thermal exhaust, with p2t, vafc, greddy profec controller, and msd ignition. I had no issues with the car other than it sat for several years with no tune and needed to be spruced up a bit. I bought the car with the above set up. Subsequently, I decided to try and go a bit of a different route. I had a dump tube fabricated, removed vafc, added 4 bar map sensor, switched to hondata s300 with p28 ecu, it has been tuned out to 12psi pushing 249 whp. It pulls hard and is nice, however I am running into a pretty bad boost cut.