Code 3 65mm pulley is very close to 178 for supercharger RPM and reall easy to put on and take off. I went that route, but havn't done a tune yet and not sure if I will. Tune will create better chance of deto from leaner running and advanced timing, hence reduced power if the deto sensor starts pulling timing out. It will be fine I'm sure for short blasts on 92 octane, but its still on my mind when putting the motor on the edge. I just wonder if tune is worth it running on the street on 92 octane pump fuel if the intake charge can't be cooled better.