My 2006 WRX is bone stock minus a Cobb downpipe and exhaust with an AP stage 2 tune. The exhaust and tune have been on for about 10k miles. Motor has about 158k. On my drive home (20 miles) what started as sounding like a small exhaust leak developed into sounding like a lawn mower by the time I got home. The video is showing the driver's side of the motor from a few different views. Any ideas what's leaking? I just moved to CO and all my tools are back in OK so I'm trying to figure out what's wrong without pulling much apart. I'm getting cylinder misfire codes and well as PFFFFand PFFFE.