Thread: engine worries

ok well today i had an MPS put on and found that the pulley that was on there was a 3.4. the issue is that i thought it was stock. it was on there when i bought the car.the car had no DP no PEM no pcm im just wondering what damage might be done.

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.