Well its possible there is no damage. Depends on whether or not you are getting any knock and how much. I probably wouldnt push it or get into boost much if at all until I could either get some mods on there or a 3.8" pulley. If its a Modular pulley, you can buy a 3.8 pulley that will bolt on. Just dont forget to put some sealant on the threads of the breather nut.