I installed a 255 FP on my Stang last summer to ensure I wasn't going to run lean with my upgraded and rebuilt Powerdyne blower (9PSI now). It sat all winter and now I'm driving it again. It's running too rich, I can tell from my A/F gauges. I've been tinkering with the idea of getting a Tweecer or even an AEM EMS, but they are all pricy. Should I go with an AFPR first? If so, is there anything I need to know before hand? What's the deal with 2-port vs 4-port AFPRs? Also woudl I want to run this inline with my 10:1 FMU?? Or would/could it completely replace the FMU?
