Ok so this has only started (or noticed) like 4 days ago. I first thought it might have been the ac or maybe a belt since its kinda humid out but it has been getting more frequent and louder as I notice more now. Today I started the car after work and heard it as soon as the ac came on. So I poked my head under the car and noticed its pretty loud right in front of the cat where the heat shield meets that brace under the tranny. I looks and saw nothing was rubbing but I'm not sure if its the heat shield rattling on the pipe or what. It is stock and I do have a after market cbe. It almost sounds like a belt is slipping but more of a metallic sound. WHAT ARE YOU!?!?!
2012 WRB WRX