I have a 96 Eclipse GST that makes a loud growling noise that seems to come from the back left on acceleration. It isn't really a rattling sound, it's more like the engine noise is amplified louder than normal when I accelerate and sounds like a guttural growl. It isn't present in first or second gear, starts mildly in third, and is very noticeable any time I accelerate in fourth or fifth. The sound is not present when I rev the engine out of gear. Exhaust is stock, replaced head gasket two summers ago. Any ideas?

 

Sounds like possibly a wheel bearing.