Hi guys. First post.
I've had my car for about 3 months and just started noticing a chuffing sound, like a "chh", when cruising around 30 mph. I have to have the windows down to hear it. Most of the time it happens in 2nd under moderate acceleration. Sometimes while accelerating, sometimes right when I push the clutch to shift to 3rd and sometimes if I am just coasting/engine breaking in second down from 35 to 25-30ish.
I just changed out my V-belts a week ago. No other recent changes.
Stock 2004 WRX 72,000 miles.
Any thoughts on what it might be?