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If I blip the throttle quickly and rev to 2000 RPM, when the engine revs down, I can here a slight "chirp" noise emitting from the muffler. I assume this is due to the turbo's turbine spinning? Is this normal?
 

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Wow this has to be like the 5th time I have answered this. I have never said it before but please learn to use the search button, it will help you a lot. There is tons of info on this fourm and the search is the only way to get to 99% of it.

Anyways, the stock exhaust makes a chirp noise, its completely normal, nothing to worry about. When you upgrade your exhuast it will turn into a soft poping noise, which is very cool and sounds really nice. I don't know why the stock one makes chirps, guess its all in the design of the axel back.
 

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wrxes have a small misfire when they decel. I think its something with the #3 cyl. running lean or it could be the wastegate. If you get exhaust, you will hear it alot more with a different resonator.
 

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Mine is doing this now too. I don't remember it ever doing it before I installed an aftermarket exhaust, but now the aftermarket exhaust is gone and the stocker is back on, I definately hear it.

Weird stuff.
 

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heh - I just swapped my stock exhaust back in and noticed the chirp as well. I never noticed it before. I searched and found this thread (Among others). Glad it was here because I thought I fcuked something up when I removed all my stage4 stuff.

All this info is great.
 
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