you should the stock crank pulley if you are running the BBK because if im not mistaking, you can overspin the supercharger and damage it. A different tune is proabably necessary, the blower itself doesnt have a tune in it, a tune is reflashed onto the ecu. I dont think an upgraded fuel rail is needed for the non-SVT kit, but im sure an aftermarket one wouldnt hurt. I didnt install mine because i had no-where and no tools but ive heard the install can easy be done if you have good tools and some time....good luck with it! [thumb]