That sounds kind of like the free FMU that Gadget suggests as a minimum and mrbigbri has on his page. I never set mine up that way, but from what I have heard it is no replacement for fuel mods. I got your PM and I have been meaning to reply, but I have been pretty busy lately and limited time online. I would say not to install the pulley until you at least have the URD fuel upgrade. I know it is expensive, but it is a lot less than having to rebuild your heads or block later. If you are not getting pinging or knocking now you very well be pinging with the smaller pulley. If your temps do creep up, I would suspect your ECU will have to compensate for pre-detonation by retarding the timing and you will be loosing more power that gaining. The only way you can really tell if you are running lean is with a wideband O2 sensor or an EGT gauge. The latter is a more course type of measurement, but still something to monitor. Personally I would take URD’s advise before anyone else’s when it comes to supercharged issues. I hope this helps and maybe someone else can add to or correct my assumptions.