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For at least a few months I have had this popping sound coming from what sounds like is inside the dash after decelerating from highway speeds. I am hoping that someone has heard this before or can help me pinpoint cause. I'd like to fix it if possible or at least know that something critical is failing or going to leave me stranded. This is a 1993 Subaru Impreza Wagon/Hatchback and has an EJ18 1.8L SOHC engine with manual transmission, AWD, and no ABS. This sound only occurs after the car as warmed up (it is silent when cold), after driving at 50+ mph for at least a few minutes, and then decelerating and driving around slower. Here is a video where you can hear the noise I am talking about: This video has the driving around cut out. This is after I have driven probably 5 miles at 55 mph and then slowed down into a subdivision. You will notice that it starts making a popping noise which sounds like it is somewhere in the middle of the dash. This is noticeable after getting off the highway but becomes even more noticeable once I slow down further from 35 mph to 20 mph. During the course of this video, I move the camera around between the drivers side and passenger side under the dash, and the on top of the dash. This noise is noticeably louder if there is a bigger difference in speed. Example: 70 mph freeway to an almost stop off an exit. This sound does not exist when the car is completely still. Or if it does, there are only one or two pops and then it stops. You will notice that the noise is not rhythmic and fairly random. I do not believe this is a problem with a engine rotating part, otherwise the sound would exist when revving the car in neutral; which it does not. This video was taken over a month ago and the noise has become louder/more severe when it occurs. This sound started somewhere around the time after I replaced timing belt (and other regular replacement parts normally done at this time), water pump, thermostat, flushed the cooling system and added brand new coolant. This may or may not be related. Has anyone heard anything like this before? Any hypothesis? Is my car dying a slow painful death? Thanks in advance!